i would go with the 156 if i were you, obviously the 153 is going to be better in the park, but its not like the 156 is not going to be either. the 156 is going to hold up better on the groomers and in the pow and will be considerably less chatery at speed, but still be small enough to throw around as you wish. also the rome mod rocker is not considered to be a jib board. my personal prefference for a jib board is a shorter board like a 153 or 154 so if you are going to be hitting some kickers and doubles and learning to 180 or 360 in the park and going for the occasional jib the 156 is a better option in my eyes, the stability of the 156 is going to be nice have aswell. bottom line is that it always comes down to personal prefference and trial and error. hope this helps!