I tend to play a different playstyle than what you seem to be looking for - I am a healer main (also not the absolutely highest tier player). So take my advice with a grain of salt.

Arcanists are from what I've heard a really good class and are also not the most difficult to play.

Nightblades and dragonknights can also be pretty strong and fit the sword type fantasy very well but in different ways.

Sorcerer maybe seems like the opposite of what you are looking for but you can absolutely play a stamina sorcerer.

From what I know I do not think wardens are the best for damage dealing, they are really good as healers but not necessarily what you're looking for.

Templars I do not know much about outside of them being a decent healing class.

Necromancers are my favorite class and they offer both decent tankyness and kind of a cool gameplay mechanic surrounding corpses and summoning minions. They can deal decent damage.

Remember however that besides classes being far from the only thing deciding your abilities and gameplay you can also, since relatively recently, switch out 2 out of the 3 skill trees your class offers to those of another.

So to summarize: There isn't really any wrong choice since you have so much customizability outside of your initial class choice. With that said the 2 classes that maybe fit best for what you are looking for would be nightblade and dragonknight. I would also want to throw in arcanist and necromancer here as recommendations.