If me and you played hockey right here, right now, what would we use as a puck?

I have a variety, you choose! Regular puck, sponge practise puck, tennis ball, or hard street ball? I supply the gear (right or left handed sticks, short, long, composite, wood, plastic blade.. complete goalie equipment, net, etc) if you don't have yours, that's what I do anyways when my friends come over to play :)