Curly, hands down. I never wear straight or wavy and I don't do heat.
I see plenty of pretty straight and wavy installs, but for me, I would just wear my own hair if I wanted straight hair.
Curly is low maintenance for me. The whole reason I wear weave is to get away from wrapping, flat ironing, etc. I don't have the time or the patience. lol
It takes me all of 1 minute to do my hair. Slap a lil gel/edge control on my edges, spray the rest with water, and I'm done.
I don't see that many realistic curly weaves and I like something different. Curly exudes more of my personality and straight hair makes me look older and heavier. Also,rainy/humid days make my hair look better, not worse. And when I'm doing "extra activities" w/ my SO, it's no big deal if my hair comes loose.