umm 2 completely different things, and 2 different scales...
As a owner of both the pede 4X4 will obviously drive over more obstacles seeing it is bigger, but will need a more expensive esc/motor setup(I spent $90 on an ESC, and $20 on a motor well over a year ago, but I got a extremely cheap and poor motor though). And if you fling in a center diff it actually handles pretty damn well.
The CRT.5 is way cheaper seeing you can have the full kit with the bits to make it electric for $120ish with tires and a body. Electronics will set you back another $120-130ish (estimated don't feel like looking up cost). Due to it being 1/12th it won't be able to drive over as much
The diff itself for the pede costs close to half the cost of the CRT.5 if you want to think about it. A setof tires fr the pede will cost close to the cost of the crt kit too
So in essence it depends what you want to drive on. Dirt, concrete, and very low cut grass the crt.5 will do well. The pede will do well on those too, as well on a more rough off-road setting but will set you back way more money.