I have the Alpines 6000k and a friend has the GPs. The Alpines are rediculously bright. Cons, you have to runs some external wiring (simple install and reversible). GPs aren't quite as bright or white. They are difficult to see during the day. Pro, plug and play.
'09 E90 M3 SG | VF620 SC | KW V3 | ARC Wheels w/AD08 | OnEighty Lights | BPM Sport coding | AA Catless Exhaust | BMW Performance Wheel | Recaro Child Seat
'13 X3 DSB with M Sport | H&R Springs | Gloss black grill | Coded by me