You really want something that is non reflective - dependant on what effects you want to achieve.
With the paper, I generally use it continuous from background, curved onto the floor. if you use it on a hard floor and keep your subjects shoes off of it, it will last a lot longer, to be rolled up again with a possible couple of more uses from it.
However, yesterday, having it rolled out onto a carpet, holes soon appeared, and so had to cut and roll some more off. It can get expensive.
For head and shoulder portraits, you can use almost anything, if you have the depth between your subject and background, you can be a lot more creative, and also makes it easier to isolate your subject into an almost 3D image up front.
Some people swear by upside down lino, I suppose at least it can be wiped clean.