Cult Gamma Ray or Death Ray as back wheel?

[craig domenici]

thx for that...i think i'll grab the gamma-ray first & see how it goes.

[Pierre Hazera]

I tried both the deathray looks more responsive and faster but the Gammaray looks more grippy
that's depends what you like.. this is my personnal feeling after few test (without timer)

[craig domenici]

i want to get a pair of 80a cults but not sure if gamma ray or death ray are the ones to get for back truck? orange=death ray/blue=gamma ray
(i have zillas & dominators but i want an 80 duro pair for those times i skate crap surfaces for long periods)

also, whilst i'm here, can someone tell me why it's so rare to see people use pps cone crushers as a front wheel?
it seems they're sold as a dedicated back wheel & i've always wondered why such an awesome wheel doesn't have a front wheel to compliment it's look,shape & feel.