If you're gonna be primarily or almost always riding powder and the deep stuff I would def go with the longer board like 159+. If its more of a half and half thing I'de go with a 155-158 but pretty stiff. If you can then demo different boards. And in my opinion it's better to go longer than shorter but that's just me. And also if you go with the shorter board and have a size 12 boot or more go with a wide board for sure because toe drag really sucks.