6.5 door + 4" dashbord speakers recommendation

[Jeffdachef 5,000+ posts]

I found 2 Pioneer amps

GM-D8604 FD class

GM-D8704 D class with wired bass remote.

Both amp look the same, but which one is better?

its because the 2nd one is a new model of the 8604. No one has tested the new model but the old model is a proven performer.  Newer might not be better since a chinese company took over pioneer so the quality could be good or bad, i'd wait for amplifier dyno results from testers to see if its worth a buy or not.