I suppose Celerity might be better with the PvP Gloves bonus.
Celerity vs Momentum?
Within 120 seconds if you move at 10 yards per second movement speed and tiger's lust grant you 70 % movement speed increase for 6 seconds with 30 seconds cooldown and if you use tiger's lust whenever possible within 120 seconds then you have additional 70 % movement speed increase for 24 seconds so you eventually have totally additional 168 yards further from tiger's lust (but tiger's lust also remove movement speed impairing effect and tiger's lust cost 1 chi)
Momentum add 100 yards within 60 seconds and add 175 yards within 120 seconds
Tiger's lust add 84 yards within 60 second and add 168 yards within 120 seconds
But of course this consider only speed and in certain situation you have more factors to add for your consideration
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