Hey yall! just had some questions..
I am looking forward to buy some PIAA's light bulbs soon..
And never really figured out which is better then other, even tho they are all PIAA's parts.

I know that PIAA has 9000 series X-tream White Plus..and 9000 series Platinum super white..
What is brighter and works better?
Should I change both of the low(HB4, 9006) and high(HB3, 9005) beam bulbs? Or just low beam?

Thanks in advance