Some of the slings and MTs you're showing are so cute! But just FYI, not all slings and not all MT are created equal. I don't know these Etsy brands and they could be wonderful, but you may want to check out reviews (if they're available for that specific maker) at a site like
The Baby Wearer. I'd hate for someone to spend all that money on a sling that wasn't comfortable, then figure they just didn't like ring slings.
I had a MayaWrap ring sling (the purple one on the previous page), and I loved it. I used it from birth to about 24 months with 2 of my kids, and it was my go-to carrier for hot days. I had a few other RSs, but if I were only going to have 1 I'd have been very happy with that one.
I drooled over the Sakura Blooms when they came out, but no way could I have spent that much on one. I sewed and made a lot of my own carriers, so I ended up making a silk ring sling for a lot less. It cost me about $50 for the silk and about $10-15 for the Sling Rings, and it was gorgeous! I didn't use it much until they were older (9 mo or so) because I was afraid of it getting spit up on and ruined, but it was fabulous with older babies and toddlers because it's so strong and folds up so compactly. So if anyone here sews, that's a great way to have carriers in exactly the fabric you want for a lot less. Here's one of the few photos I have of my silk RS. Lauren was almost 2 and sleeping in it at my sister's wedding. (For those of you learning to use RSs, those rings are too low. Between the silk and the slippery dress, it just wouldn't stay in place.)
I'll also add that I didn't like either the Ergo or the Bjorn much. I prefer front carries even with toddlers, and the Ergo wasn't as comfortable for me in a front carry as a Mei Tai was. I do back carries when I need to, but I like the snuggle factor with front carries and being able to talk to the child more easily.