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 | VF620 SC tuned and coded by BPM | KW V3 | ARC Wheels w/AD08 | OnEighty Lights | AA Signature Exhaust | BMW Performance and IND trim | Recaro Profi and child seats
'13 35i M-Sport X3 | JB4 Stage 1 | BMS Intake | H&R Springs | Gloss black grill | CF Wrap and Coded by me