Mouse and keyboard, cause I can't physically use a controller. Simple 2 button and scroller mouse for the same reason.

I came from console (other games, not ESO), and for a few years I used gamepad for almost everything. I still use it for combat. The character movement is much smoother on controller and allows for finer control. That’s about the one advantage it has, in my experience.

For everything else now I use keyboard mode. (Settings are now set to switch automatically, which did not always exist as an option.) There are several outstanding issues that mean gamepad is unnecessarily an inferior experience for non-combat tasks. I got tired of switching modes just to pick up a treasure map I already had in my bank or to see into a guild bank that I didn’t have withdrawal perms for. There are also critical tooltips in keyboard mode entirely missing from gamepad mode, as well as helpful details like numerical progress towards ranking up a skill or skill line. What pushed me into using keyboard mode most of the time was actually a very bad bug where the roster would shift every time someone changed zones or logged in or out, so roster management was an utter nightmare with promoting/demoting/kicking the wrong people, but that only impacted gamepad mode. It took them months and months to fix, and it was a recurring bug too. Gamepad mode just isn’t designed and maintained to the same standard as keyboard mode for features like that.

well, If I don't use mouse and keyboard the character s does not move.

I think it largely depends on what your preference is. I haven't played ESO with a controller, but I used to play Bethesda games on a console. I switched to PC and have been playing for several years with a keyboard and mouse. I recently decided to try a controller again when playing a few older Bethesda games I have hundreds of hours each on console but now the controller felt... weird. I now prefer keyboard and mouse.

In the Elder Scrolls games there is not that much difference in how "successful" the playing is, but in Fallout series I noticed aiming a gun is easier with a mouse. Trying to aim with a controller now made me think how could have I ever played like that. Other than that, it's just what you're used to. Not sure if that translates to ESO since there are way more buttons to press in ESO, but if the older Bethesda games are any indication - play with whichever feels more comfortable.

I'm comfortable using both controllers and keyboard & mouse and use both regularly, but it occured to me a while ago that (maybe because I'm ok with both) I rarely choose, I tend to use whatever the default is for the game/platform. That's especially weird for PC games because I will routinely change the default keybindings, both to make use of the extra buttons on my mouse and because I'm left-handed so default keyboard layouts tend to be uncomfortable for me. But I rarely think to try a controller even though I have 4 or 5 different ones in the room which would work. (Plus several older ones which would need an adapter to connect to the PC.)

That's exactly what I've done with ESO - never tried a controller but have completely changed the keybindings.

I should experiment with it more but to be honest I'm pretty lazy about it, I make a point of trying Switch games handheld, with the pro controller and with the two seperate joycons to see which I prefer, but then tend to stick with 1 for that game.

Controller for when I'm on a laptop...just for gathering resources though. K/b mouse for everything else.

Controller. It's the most comfortable and easiest for me to use. Wrists tend to hurt after laying on the keyboard for awhile. I only use the kb&mouse UI for linking multiple things or putting things in the trader. People will whine and say that controller is a handicap, but it's just simply easier for a lot of people. I can pull over 100k dps on the dummy with a controller. It's a matter of skill, not whichever input you decide to use.

Controller here but last couple of days it's been disabling itself. I did buy a new PC recently so might have to double check my settings.

PC, mouse & keyboard for everything.

If I’m doing some casual questing and/or fishing / survey/treasure map hunting I can use the controller. But most of the time I’m using k&m.
Especially with trials and dungeons.

Controller for trials, dungeons and running around in the world. Keyboard mouse in town for crafting, guild store work. I just like movement and combat better with controller.

KB/M, since the mid 80s. Never touched a controller, no need.

Optical switch mouse and keyboard, for the lowest latency I can get. I've always disliked controllers and always will. I've never found them to be as fast or responsive, personally. (I also just don't like the console interface)

I'd been using the controller for all TES games till now, and ESO is in fact the first ES game I've used the k/m for. It seems like there are just so many more functions in ESO; I spent some hours trying to use a controller for ESO but it didn't feel natural.

I spent a couple thousand hours on PC, and tried to use a controller a couple of times, because even though I'm a programmer for 40 years, I lose my bearings on the keyboard in the heat of battle. I never really locked in.

Then I took a long break, and started new on the PS, where a controller is the only option. In a couple hundred hours, I grew to really like it, and I think it makes combat way easier than fumbling around on a keyboard, where you have to use movement keys with the same hand as skills. (I know some people use a mouse with a whole bunch of buttons, but they're too small and too close together for me.)

I'm back on PC now, and use a controller for everything except inventory management, crafting, and banking. These things can be done with a controller, but after mods to assist those functions, the controller really gets left behind.

As others have pointed out, ZOS has made using a controller on PC much easier now with automatic switching of modes. I just wish the UI zoom level was consistent. You have to play with the setting until the mods stop drifting around the screen.

I've used a Playstation controller, which was flawless, and never gave me any trouble. I've now "upgraded" to a SCUF Envision Pro. The hardware is fine, but the software is sometimes glitchy. Recent updates have made things better, which means they're still working on it. But it has tons of extra buttons that you can assign to various things. I especially like the macro I have on one button which maps to a series of keystrokes that types the slash command from Beam Me Up to immediately teleport to party crown.