definitely loved my moby wrap for when babe is little. it's great for wrapping babe on you once they've fallen asleep on your chest and you want to get up and do a few things. There are so many positional/wrapping options.
I stopped using it when babe was bigger and switched to an ergo. It was way more convenient to get on and off and has a front pocket perfect for keys and money while running errands.
I had a ring sling for baby #1, but gravitated more towards the moby for #2. I liked that I could fine tune adjust the moby more than the ring sling, personally. also, i wrecked my shoulder/neck from the ring sling for my first. as much as i knew i was supposed to switch shoulders, i found it awkward to so always carried on the same side, constantly adjusting, trying to get it off my trapezius muscle! The only time i still used the ring sling second time around was for a quick on the hip assist while getting dinner ready when little one just HAD to be HELD!! :)