Hum… that’s a hard one for me. I like them both for different reasons.
I started out with the Maya and was very happy with it. While it does have more of a learning curve which can be a bit of a pain, the adjustability ended up being really important for us. My DD hated the cradle hold and the Maya allowed me to switch her to tummy to tummy and support her head with the top rail (not something I could have done with a pouch.) Being able to tighten it just so was also important to me early on because she felt like she was more secure in the Maya. Plus, when the weather turned cold, I was easily able to adjust for heavier coats and snow suits once they became necessary.
However, this summer I decided to get a Hotsling and I'm very pleased with it too. For the hot weather, I like that it is a lighter weight fabric than my Maya and I don’t have to deal with the tail. I like the padded rail under her knees. Plus now that my DD is pretty much always in the hip carry (adjustability isn’t as big of an issue) popping her in and out is easier than with the ring sling.
So I guess I vote for both, although if money is an issue, I'd try the Hotsling first and then get a ring sling of some sort later towards fall or earlier if the Hotsling doesn’t work out for the newborn phase. You could always use the Hotsling next summer when your child is older and in the hip carry.