Sorc.
If you learn everything there is to know about a Sorc they are just NASTY!
There are some people that will say DK's are easy mode and they are right, but if you are looking for something that can do just anything and do it well...... Sorc except noooooo substitutes!

I play a dual-wielding Nightblade and can kill just about any normal enemy with three hits, significantly more for bosses.

They are all good. The player is what makes a particular class good.

For a new player a magicka Templar is probably better than a sorc.Just wear all light and use Puncturing Sweep +some stuff from level 1 to vr14 than use Puncturing Sweep some more. Very good in the next patch at least for solo pve. The Sorc is great and ultimately better at soloing but I think It's slightly more involved as it require using 2 buttons and 3 toggles instead of just one button.

Have to say I've really found them all easy to play with the caveat that they all have learning curves. The Templar, because of healing, is probably the easiest. But man.. sneaking up on a big old troll and one-shotting it with your two-hander.. gotta love those Nightblades. And the sustain of a DK in battle... For all the griping that goes on here on the boards this game is actually pretty damn fun. What's frustrating are the bugs and somewhat random way ZOS chooses to interact with the community. You never know if the next patch is going to nerf your favorite grind spot or make your glass cannon pure glass and no cannon.

see .. there is not best class, its all a matter of perspective

I think the best solo class is the one you feel comfortable with. I play dual wield DK Nord. It's not the strongest one, but I like it.. wich is probably the most important; Fun

I particularly like Templar at the moment for solo - good self heals and very versatile. By that I mean you can build them as magicka healer/dps, tank, or stam dps pretty effectively.

Templar.. I can solo anything except a few Vets

I wouldn't say there is a "best" solo class, becoause all can solo very, very well. Tey just solo differently.

NB's murder mobs before they cna really hurt them and use drains to keep hp up.

Dragon knights are naturally tanky without really doing much to them, and with a solid 2h weapon stam build can wreck faces and take little damage.

Templars healing spells make them pretty much unkillable solo'ing, however they lake the dps of the other three if you go with a more solo build. Not by much! but a little less. It;s the trade off you get for the survivability.

Sorcs just melt faces all day before the mobs even have a chance to look at them. They can be pretty squishy depending on how you build them, but with them huge bust damage, that is generally not a problem.

in the end, it's just make whatever you prefer to play. They are all very viable so solo with just about any setup.

I'm in the process of leveling up all four classes. My experience so far is that DK are probably the easiest from the beginning, it's hard to make a bad DK. Sorc are indestructible once you figure them out and get to level 20 or so. Templar are also great at soloing once you get a few levels and a decent magicka/stamina pool, they're just a little slow in early levels. Nightblades tend to take the longest to figure out effective builds unless you happen to stumble on the right combination early on.

I finally found a class I love, Imperial Templar with 2H as primary weapon. Stamina based. It's fun and I get through stuff I couldn't with my NB.

With a Templar I've been able to solo a lot of group content, including some Craglorn group delves. They can be built to be very tank and have great heals and regen at the same time. They don't put out the most DPS, but it's steady enough to kill things while keeping yourself alive.