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jmellberg800i currently have both and ski at granite peak. the moments are fun on jumps and a little more flexy in the tails more of a jump orientated ski i feel. on3ps are gonna be close tothe moments with tail flex but for sure a lot flexier in the tips. on3ps are fully symmetrical and moments are 5 cm shorter in the tail. also momet vice edges are 2.2 mm while on3ps are 2.5 so if your doing more rails on3ps will hold up better. if your gonna being going around in the side country the on3ps are wider obviously so they will float a bit more. I have found that my on3ps chatter more on hardpack when going fast than my vices do. both are great skis and opn3p has great customer service. not saying moment dosent i have just dealt with on3p more and they are super cool
long story short:
if you go fast on hardpack and hit big jumps and a few rails go with the moment vice
if your hitting more rails and jibing anything and everything in sight go on3ps
both are great skis and im probably gonna buy the vices and magnus next year (magnus is replacing the filthy rich)
good luck