Originally posted by Shadowfax
they should both be fine for running out to a TV, as long as you aren't doing anything else while running the visualizer (which is hard to do anyways, when it is taking up the whole screen). both models have very strong video cards, and the CPU will run at 100% usage during any visualization, no matter what. neither should drop frames.
don't get the powerbook just for visualization, lol. that would be a HUGE waste of ~3-400$.