The Highlife is a pretty aggressive board, great to charge, stable at speed, fun to carve, but it's pretty stiff = it won't be fun in moguls (imagine to ride a ironing board through bumps). Don't know the other two.
Give as much info as possible what you expect from the board, what you're going to use it for and the typw of rider you are.
Will you use it only for pow/trees? How deep pow? How do you ride? Fast n aggressive? Playfully? Cruising? Hit natural jumps? Ride switch? Will the board be your specific pow/tree board only or do you intend to use it on groomers/park/... as well? If also on groomers, what conditions? Mogul runs? Hardpack? Ice?
The more specific you describe what you expect from the board, and what you liked and disliked in boards you had so far, the better the recommendations on models and sizes you're going to get
Size is always a trade off between float/stability and agility. You're into riding deep pow in open terrain, straightline, high speed -> go bigger. Riding narrow terrain, quick turns, need for agility -> go smaller