I have the Air Max FB mints and the dunks, and honestly, it's not even close. The quality on the mints is average to below average, and they do not fit right - they are very snug and just awkward fitting - and this seems to be the general consensus from folks I've talked to, not to mention folks on the board. Plus, they are EVERYWHERE, you can get them without a problem if you keep your eyes open. For what it's worth, I truly believe trading the very limited, high quality, kickass Undefeated Dunks for the GR, poor quality mints is absolutely insane, a horrific decision you will regret for a long, long time. DO NOT DO IT. PERIOD.
That said - every time i wear the mints, I get a lot of compliments (generally from chicks who don't know what the difference). Even so, DO NOT GIVE UP THE DUNKS!!!