Well after having a hard time deciding I ended up on Roe female, their eyes are amazing, and I love their lore. My main reservations for them was that the really tall races tend to look pretty bad in robes or as casters in general, and she'll be a summoner.
Aside from the issue with them being tall, I think a lot of players want their characters to appear "young", think teens to early twenties, and Roes look more mature. Their mannerisms as well are less "girly" than Miqo'te, who are pretty much going all out on cute in the animations. While the Roe characters aren't going for the girly and cute animations, which probably would look terrible on a character of that size anyway, I find them to look quite elegant.
Aside from the issue with them being tall, I think a lot of players want their characters to appear "young", think teens to early twenties, and Roes look more mature. Their mannerisms as well are less "girly" than Miqo'te, who are pretty much going all out on cute in the animations. While the Roe characters aren't going for the girly and cute animations, which probably would look terrible on a character of that size anyway, I find them to look quite elegant.