From what I hear the PC lift is the easiest to install. However, I don't know from personal experience. Hopefully somebody that has either kit will chime in for ya.
'07 CC 4X4 banks ram air w/ tb screen removed, banks monster exhaust, prg minilift, PRG UCA's, 5100's mid perch, sway bar removed, 5125's, DK shackles, '08+ brakes with Powerstop D/S rotors and pads. PRG SS braided brake lines, headlight mod w/ Morimoto switchbacks, Legit 55w 6000 hid's (lows and highs), modded tail lights, street scene grille shell, xd diesel 20x10 w/ terra grapplers, pinch weld mod, axle vent mod, BW pocket flares, PD'd stuff, BL step rails, SM designs bezel kit, LPD Tru-cool radiator bypass mod, ADD W1 magnetic oil plug, Cajun B pipes.