Prob mostly just drivers and conditions, but I've repeatedly from 1.8T car to TT's with twin turbos, to newer VW's seen APR's shop cars go incredibly insanely faster than the same 5 other customer cars with the same mods.
On the flipside OF THAT, i love those older AWD vr6 twin turbo bugs they built. They ran like 11.0 something like 52 passes in a row for a magazine tester.
Ironic, here we are, 10 years later and they have a golf that.... Does the samething with "better everything".
I'd drive them back to back, but I'd def give the golf R a shot before just buying a focus RS. Assuming i was in the small market for either one ( which I'm not ).