I like both, but I actually like the Midlander's face better for some reason. They do look a little animesque, but people often say that about the series. If you want to stick with your established character and backstory, stay a Miqo'te, but if you don't mind rewriting, I'd at least try the Midlander.
You could always spend a little extra time making both before you actually start playing during beta, and walk around the cities to see which one's animations and emotes you like more. Kevaraan was originally a Midlander himself, but I didn't really think any of their hairstyles fit, and I liked the animalistic or feral aspect of a Miqo'te, since he's had that flavor in my other works. I might change him back come beta, but I think I'd like to stay a Miqo'te.
You could always spend a little extra time making both before you actually start playing during beta, and walk around the cities to see which one's animations and emotes you like more. Kevaraan was originally a Midlander himself, but I didn't really think any of their hairstyles fit, and I liked the animalistic or feral aspect of a Miqo'te, since he's had that flavor in my other works. I might change him back come beta, but I think I'd like to stay a Miqo'te.