The difference between boards when you're talking about a few centimeters is pure preference. It may require a little bit more strength to spin or turn a 152 vs. 157, but if that's what you ride, your body will adapt.
Longer will be a bit more stable at high speeds, float a bit better in powder, but not be quite as agile if you're interested in trees or throwing some freestyle into your freeride. Keep in mind how often you intend on boarding, you'll build strength plenty quickly so long as you're out on the mountain frequently, but if you aren't going at least once a week, you might want to err on the side of shortness.
Hey guys, thanks for the response. I don't think I'll be riding pow anytime soon. And I think I'll be roughly riding for about 10 days a season. I think I'm gonna go for the shorter length. Since I'm still kinda new to the sport, I might wanna try some stuff in the future.
I'm 5'7", 155 lbs, and I ride the 157cm T.Rice. I used to ride a 153 before I picked up this board, and I was a little worried about the length, but it's not an issue at all. I can spin it just fine, it handles really well at high speeds, and jumps like a dream. So if you want the extra length, don't sweat it, just go for it.