It's a hard one.
Qunari and dwarves are my two favourites... humans in third place, then lastly elves.
Dwarves are good for magical resistance, and if you take a fancy to a background history of being a carta thug. Contrary to what many people are saying, I thought it was quite easy to create a decent looking dwarf, both female and male.
Only down side really is feeling... inadequate, during romances. 
I also noticed that dwarves seem to be a lot faster, getting around in the open world.
Qunari is great, particularly for the warrior class because you receive a physical bonus, plus it sort of makes sense, you have the height and the strength, plus you look bad-arse. Qunari also have an interesting background story, with a mercenary company.
But as others have said, the range of armour is horrible and not aesthetically pleasing...