I have:
Several Maya Ring Slings (Unpadded)
A Maya Pouch
A
Baby Trekker
A
Didymos
A
Moby Wrap
A
Sakura Bloom Ring Sling
My favorite by far is my regular Maya Wrap ring sling. It's versatile, compact, and comfortable. The learning curve isn't too steep; plus, the price is reasonable. If I could only have on sling, this would be it.
I like my Maya Pouch for the diaper bag. It's even smaller than the ring sling, but less versatile.
I like the Moby. It's very comfy. It takes some time to learn to tie, and the length can be intimidating. I also don't find it nearly as easy to nurse in. Still, the price is good, and I like it a lot for house & yard work, and I use it almost every day to put Kira to sleep (pop her in the Moby, bounce on the
fit-ball, and she's out like a light).
I'll probably try a Mei Tai when Kira starts walking. They're so pretty!
Not really thrilled with the Baby Trekker, and my Didy looks nice, but the learning curve is very steep, and the price is insanely high (I got mine cheap on German eBay when I lived in Germany, or I wouldn't have it).