Honestly, we're only talking 2-3cm here. There's not gonna be a huge difference either way. If you rode some park, I'd definitely say 159 as it would be quite a bit easier to spin. However, with you just cruising groomers and whatnot, the 162 will be a little more stable at speed. Really, either one would be fine. When torn between two sizes, I generally opt for the slightly bigger, which is the opposite of most people. Most opt for the slightly smaller. 6 in one hand, half dozen in the other.
"People say that marijuana smoking is going to get in the way of my career. I say to them that on the contrary, my fighting career is getting in the way of my marijuana smoking." -Nick Diaz