Personnaly i prefer a combination of cord/string for repair and DIYing. paracord is a jack of all trade, but a master of none. It multipurposeness also stops, when you have used it. Innercord is great, but a bit annoying to get when you have already used the cord to tie things. It's also stuff i generally don't use when practising, simply because i like stuff that rot away when i forget to retrieve it and it's cheap.

In my case, for the majority of tie-ing, twine is good enough. I don't use it for long term repairs or building anyways, so no rotting issues for me. I only use paracord and other more high-end cords for stuff that needs to be durable or/and hold a heavy load.