My 13-year old son and I are planning a Baltic cruise in late May. We have to choose between the Century and Princess's Star Princess. We've cruised both lines before, but not in Europe. Star Princess is considerably larger, that much I know. Any thoughts as to which ship might have more teens on board? (The itinerary on Century sounds better and it's 12 days vs. 10 on Princess, but I'm trying not to be selfish here.....)