A few things to consider.
1. The Gnu Mutant is a terrific binding. It is even better this year with larger more fully releasable ratchets.
2. It is a tricky comparison between a Flow Flight 2 at $149.00 and a Gnu Mutant at $289.00. $140.00 in a binding buys you a lot of extra performance! A nylon baseplate and basic surf strap will not offer nearly the lateral control of aluminum and one of the higher end straps.
3. This is Flow's first year doing a toe cap.