In my opinion, the 11/12 is an all-round easier to ride and more powerful wakeboard than the 09/10.
Pop is hard to quantify. The 09/10 is certainly slower and I guess the right kind of rider could make it pop more, but in terms of raw-pop the 11/12 has a slight bit more surface area. I ride the 08 and the 12 shape better all the way around: Pop, consistancy, endging control, everything.
Bottom Line, if you liked the pop, handling a speed of the 2008 you will definately like the 2011/12.