either amp shold work fine for normal speakers-- it is kind of personal preferance-- i don't think that you will be able to tell too much of a difference between the 2 in a blind test.
as for the pro's/cons: a auto amp is typically more expensive than a small 'motorcycle' amp, but usually makes much more power, but are much larger, but the motorcycle amps are reported to be just as good as factory stereos, and are usually less than $100 for a 4 channel version...
the choice is yours (i don't give brand suggestions for audio equipment-- audio is too subjective to get a reliable opinion in most cases--i prefer to give advice that allows you to make your own decision-- then you can't blame me when it isn't what you want )
My OLD 2001 Mitsubishi Eclipse GT:
"The Project That Never Ended, until it did"
next project? subaru brz
And you sound like getting the Habey to work is a problem... is there something I don't know about that I'm missing?
p.s. - Btw, up here in igloo land, it's Sirius satelite, not XM.