I perviously had a plastic/rubbery adidas one, then I bought a nice leather one, but I have since gone back to using the plasticy one as it spins a lot faster (less resistance). It doesn't really matter what rope you use, just as long as it's a good length for you, and it's reasonable quality. Also look after it by hanging it up always as rolling it up or folding or crappy storage of it will lead to bends and kinks which really slows the rope down.
ANY rope does the job really, but it comes down to preference of what the rope is made of. Go do a sport store and compare leather vs plastic and see which you prefer. Don't worry about brand, although i'm sure people can recommend the brand that they've bought that has done them well over the years.