keep my 7xl or get 9xl for my emaxx

I run the Medusa 2000 in my Erevo and it's much better then the 8xl in my maxx.It's got more power and runs cooler on higher gearing.By the time you add the heat sink there's not much difference in price.

[petewalford17]

ive got rc monster clamp and 7xl is the 9xl ok or the madusa beter then the 7xl so should i keep my motor or change it i would keep it if i could get the gearing right but if i got a lower kv motor would i get the performance still.