All (at least one of each on each of my 2 accounts), but most are Female Norn followed by Male Charr and Female Sylvari. The Main on my primary account is a Female Norn Necromancer/Reaper and on my secondary account it's a Female Sylvari Necromancer/Scourge.

Finding good looking (other than heavy) armor for Charr is actually quite difficult. My Charr Ranger is wearing an almost complete set of Accursed Armor which imho is one of the few medium armor sets that works on Charr. What kinda pisses me off about Male Charr is the "new" muffled player character voice and that mounts look generally too small for them. Otherwise Male Charr especially in heavy armor could easily be my favorite characters in the game. (Guess who is my favorite NPC in the game.)

My Sylvari are wearing mostly racial or Nightmare armor, because I found these to be the only sets which actually fit the race. But then they look awesome.

Finding armor for Asura is also quite difficult. But I noticed that pieces that in my opinion look too flashy or clunky on bigger characters often work quite well on Asura.

From all races I find Human to be the most boring to play Fashion Wars with. I agree with the following statement I remember reading on Reddit a while back:

Norn Females (as opposed to Human Females) look like they actually eat once in a while.

I started to play Charr, because I wanted to try something different. In other MMOs I have often played elves and humans. But I was too annoyed on the clipping problems they have. It was extremely hard to get a good looking character especially on mexium armor. So I went back to playing Norn and Humans.

At first charred and Asuran just to mix it up from human/elves. I now have collected a few of each over time.

I usually choose humans, but I gotta say that GW2 has some of the most unique and interesting races of any MMO.