brushless rusty or 1/8 axis

i allready have a rusty roller thats collecting dust or i can buy a duratrax axis roller for 50 bucks and dont know which one i should start a building.the only thing is that the rusty would have 2 run 9 cell packs.what do u guys think? oh i forgot if i do the rusty ill run an 8s and for the axis a 7or8xl on 18 cells.