>>1481146Really depends on what you want to do. There's nothing inherently wrong with paracord, but I just think it's kinda overhyped and not nearly as useful as everyone believes it to be.
As I mentioned, if you want something strong and light, get Dyneema cord. You can splice it, it holds several tons, stays dry in rain and is super hard to destroy (unlike paracord in my experience). It's a pretty expensive, though.
If you just want a guyline, 3mm synthetic cord from your nearest hardware supply store will just do fine.
If you want to hang a hammock, I suggest you get straps, either 1" webbing (can be purchased at well equipped outdoor shops as backpack straps by the meter) or real tree straps (literally the same with loops sown into them). You can also combine the webbing with dyneema for that extra weight saving (and admiration from other hammock campers).
But generally as an UL hiker, I haven't needed any spare cord. If I need some, I usually know exactly what I'm looking for. In a case of emergency, you can always repurpose the guylines from your tarp/tent or use your shoelaces. Or you can wrap ducktape around your hiking poles or an expired bank card and keep it in your wallet or 1st aid kit.