I'm thinkin the 147. I am actually super muscular, I'm a rock climber and martial artist. Everyone seems to be leaning toward the 147 for east coast. Cadence is pretty soft flex. How's tricks with the 149?
What size board do you have now? I think you should be able to handle the 147 fine if you are muscular and it's a soft flex (but again, I'm biased to longer boards). I'm on a 147 now, and I stay out the park on it - it's purely a freeride board (so it's pretty stiff) - so I'm only going over the occasional natural jump or roller. Could you rent or demo a couple boards with a similar flex at both sizes?