I have one from JudoP that is, in my mind, my "main" sling that I use for rocks and tennis balls.. I have one from C_A that I also use a lot and have in my coat pocket at all times. Another one I carry around a lot but haven't had much chance to use yet is a seat belt sling from vetryan. The two Tibetan AmdoCraft slings I use a lot, but really only in winter. Good for snowball slinging. The very first paracord sling I made I also bust out from time to time, mostly for rock slinging at the cottage where I first learned to sling
I have a super simple paracord sling that I use with the dogs when we are looking after them.
As you can see, most of the slings I use aren't actually made by me
I do have a lot of other slings though, including my own ones, that I rotate through and pull out for the heck of it now and again, but those listed above are the main group.