Please don't use a stretchy type wrap for back carries, it's really not safe! See the video.
Having used slings extensively for both mine, all I can say is that different slings work for different people. And that includes the baby! DD1 loved being wrapped, and that's all I ever used for her. With DD2 I first used a Moby, then a mei tai, then a woven wrap for back carries. She hates being in a wrap though, too confining. After some trial and error we've finally figured out that she likes the manduca.
So there's a good chance you'll have to try a variety of slings before you find the ideal one for you and your baby. Sling libraries and sling meets can be really helpful with that. What sling you want can also change over time. The good news is that slings have excellent resale value. I've bought most of the carriers I've used second hand via Facebook. Most I then sold on for the same I paid for it, so losing only a bit of money for postage.
DD2 is now a big 13 month old and I carry her for hours at a time still. 2.5 yo DD1goes in the buggy, don't drive so walk everywhere and it works great for us.