Gigarec Mode1 or Mode2/XA?

Hello,

i’m currently experimenting with Gigarec and CD-R’s using Nero (6).
What is the best method to burn those discs? Mode1 or Mode2/XA?
And should I use DOA or DOA/96?

Greetz!

PS: It’s for playing MP3 CD-R’s in my Alpine carradio…