I used a ring sling with my daughter, but only until she was about 6 months. She was so big and so heavy, a one-shoulder carry just didn't work for us for much longer than that (though I also know mamas who strongly prefer ring slings and could happily carrier their kiddos in a ring sling until they were 2 or 3 --- different strokes, right?). Also - we tried just about every different kind of baby carrier there is, but we wound up living in our Ergo from the time she was born, until -- well, now. I can still wear her in it when I need to (she's about 4.5). And we love it. Wraps have a learning curve, but they can be really great, too (though I prefer the sturdier woven style to the stretchy jersey style, although it's easier to tie the jersey wraps than the woven wraps sometimes).
I have a girlfriend who made a single-layer silk ring sling that I borrowed for a long time, and it was safe and supportive, and I loved it. It was light-weight, easy to pack, easy to adjust, and I felt regal with that gorgeous silk. It was really special. (I'm not much of a sewer, so I never tried to make my own.)
Important to note, though, babies have preferences, too. My daughter HATED the pouch we tried, and she wasn't crazy about wrapping (she wanted those little legs to be able to move more freely). She was generally content in the ring sling, though, since we could get her into loads of different positions easily) - and she always cozied down in any kind of soft structured asian inspired carrier -- mei tais, onbuhimos, the Ergo and many carriers like it.