Just need to verify an adapter for a new head unit

[alfa147x]

I'm having a new head unit installed in my friend's J30

Going with this:
http://www.amazon.com/Metra-Amplifie.../dp/B0007WTF5C

is better than going with this:
http://www.crutchfield.com/p_142C4NN...avf=N&skipvs=T

Right?

 

[Barfo]

http://forums.anandtech.com/showthread.php?t=2209850