A few years ago when I first joined this forum there was endless talk about which was the best rubber to use and the discussion went on and on.
My own view is that there is not much to choose between them although everybody has a preference. Why not try a few different brands and see what you settle on.
All of the various suppliers carry a range and I dont think there is much difference in price between any of them. There are so many excellent suppliers these days I hesitate to recommend one over the others but try Wintecs
www.wintecs.co.uk as a starting point. I only say go to them because they do free delivery which is good on small orders.