I'm getting the K'tan because its easier to use, has less fabric, and is better in hot weather.

I also have the baby bjorn so I can have an option in case I want to switch b'twn carriers.

I have a baby k'tan and I love it! It takes a couple of try's to get used to it but once you do it is very easy to use. My friend has the moby wrap; when we go places together it takes her much longer to get her baby situated. I ordered a medium and have worn it from size 12 to size 8. They make one that is part mesh (I think I will get one for summer) but it only comes in black or white. Good luck with the baby!