The SL's are my favorite binding right now. They're light, ankle strap is extremely comfortable, toe strap is super responsive, assym highback is flexible and supportive, dampening is soft enough to absorb impact but not so thick to take away the feel of the board. I can't say enough good things about them.
The last Cartel's I rode didn't have reflex but the straps were great. Flex was in the mid range. Highback was responsive. I actually liked them for park riding a lot.
I haven't ridden the Maestro but I've ridden the Capo and Ride's metal baseplate are super stiff. I dont know how much the urethane highback softens it up.
Each binding has a different feel and flex pattern so really the best way to decide is to try them. But my top 2 are the SL's and the Cartel. I'd throw in the Raiden Phantom as well.