2handed dragonknight works out well, and it's got a good bit of value to groups since you'll not only be doing heavy damage, but you can also offtank weaker mobs. Dragonknights and templars both have some good defensive abilities that mesh well with 2handed.

I dont typically recommend dual wield, however, for anyone other than sorcerors or nightblades (unless you plan on using a 2hander as your second weapon). Other than 2h's Momentum, the only way to get the major brutality buff (+20% weapon damage) in this game is through the sorceror's surge ability or the nightblade's power extraction ability. Dragonknights and Templars dont have those abilities, so to maximize damage you'll need to use a 2hander and the momentum buff. If you want to use dual wield on your second weapon slot, that works well enough, since you can activate momentum with your 2hander and then switch and you'll still have the major brutality buff for 20-30 seconds.

For any stamina build, you'll want medium armor. If you want to do an offtank/tough melee character, go with 2 heavy (shoulders and chestpiece) and 5 medium (head, legs, bracers, belt, boots). Otherwise, for pure damage purposes, go 7 medium. Spread your attributes with 3 points into stamina and 1 point into health, repeating. For a dragonknight, you may want to go 1 into magicka, 1 into health, and 2-3 into stamina repeating, since you'll be using non-stamina class abilities a little more (like reflective scales, burning talons, lava whip, or dragonblood).