Olympic size rinks are great for producing more offense. Lots of space to move the puck around the big D men. NHL rinks promote a more hard nosed game, with more work in the corners. Most college rinks are NHL sized. But rules have evolved in college hockey that has done away with a lot of the hard nosed on the boards corner play. So it is kinda in limbo. I wish they would settle on a size for everybody, and get on with it.