Losi 8 conversion esc

I have converted a Losi 8 into a brushless buggy. I am running a feigao 8XL brushless motor and a 6s 5000mah lipo pack, I now need to upgrade my esc and was wondering which one to choose a Quark monster pro or a MGM compro 160 amp 18 cell brushless car controller this is the $145.00 dollar one I'm not sure what the difference in the other MGM compro other than nimh cell limit. Thanks for any info you can give.