i used the ultimate baby wrap (same thing just a diff brand). some ppl find them very complicated to wrap around you but i did not mind that as long as i was not trying to do it with baby in hand. my baby was super comfy once in and i also found it very comfortable to wear for an extended period. unlike the sling which was NOT comfortable for long periods. sling was great for a quick in and out of a store or something but not for an all day thing or a long walk. the wrap criss crosses your back so it distributes the weight more evenly whereas the sling pulled on my shoulder and back on one side. an upside of the sling is that is it is small and easy to put on/put baby in compared to the wrap.
just keep in mind that everyone is different, lifestyle as well as our bodies, so what is comfortable and useful for one person will be different for another. i strongly recommend going to a store where you can try things on and also purchasing from stores with good return policies. personally, i returned a ring sling and mei tai, and i kept my wrap and sling because i found them useful for different things. AND i only used those 2 until my baby was about 8 months and at that point i felt he was too heavy to carry in those anymore. they are technically usable for much longer but i was not comfortable anymore. now i use an ergo and i highly recommend it for a baby 6months +.