I like the Maya wrap best, although I acknowledge that it's really up to personal preference. Have you had a chance to try both on and walk around for a little bit?
The Moby has stretchy fabric which cut off the circulation to my dd's chubby little legs the first time I tried it. I know that's not normal and it means I didn't have it adjusted quite right, but it made me leery of the learning curve. And for my body frame, it just didn't feel as comfortable distributing dd's weight across my back as the Maya wrap did.
I liked the Maya better because the fabric felt sturdier, I wanted metal rings for durability and ease of adjustment, and it was more comfortable for me to wear. I found it very quick and easy to put on and take off, and getting dd in and out in different positions was easy for me to learn. Nursing her was easy too. That pocket has turned out to be an awesome thing to have, too, although I didn't take that into consideration when I chose the Maya over the Moby.