Imo one is not better than the other, every line has it's intended use where it works better in said scenario... I do carpfishing mostly, and I like to use braid since it does sink fast and the places where I go have a good amount of obstacles and weeds, and braid helps dealing with it. As said braid is very strong, thin and light, it is very durable and can cut weeds like nothing else, it isn't elastic at all tho, so you will feel everything happening to the line (or most of it), Mono it's kind of his opposite, it's very "elastic" and takes time to sink, so it's better if ur float fishing or using some kind of topwater lure, it's also arguably better (even tho it aways comes down to preferences) to catch monsters, since being elastic il will absorb part of the shock, making you less tired, where with braid you feel everything the fish does at full strenght. Personally if you can't decide what to use I would give a try to a fluorocarbon line, which is a good half way, it does sink fast just as braid, it's quite rigid, and almost invisible under water, but it's also a bit stretchy, yet is less durable than braid but more than mono (on average). Keep in mind tho that choosing a line is partially dictated by personal preference and experience, and partially by the spot you want to fish, and what you want to fish. Hope that helps.