For soft structure carriers, I have 1 boba 3G organic and 1 i-angel. I like both but got i-angel cos of the hip seat base and can face out without worrying about the pressure on my baby's groin.
For Ring sling, I have a linen RS and a woven wrap that's converted into a ring sling for my 18 month toddler. RS is easy for quick and short trips, nursing young babies outside and less bulky.
You should bring your baby and test if your baby likes the carrier. That's how I gauge.