Between this 2 headunit, which is better for SQ ? The only concern that i have for 9450 is the usb is not in the front panel.

Definitely 9450 with 24bit DAC.

Bothe are 3 band EQ, so no diff there.

USB behind not so bad what. Route the wires behind to your glove compartment then settle.
Like that want to take down face plate for anti-theft also easy.

And trust me, it's not like you'll unplug it everyday anyway (and you wouldn't want to do that, just look at your laptop after a whole year of plug in-plug out, very bad =D)

actually i do, because i use my car's usb for my office music listening too

I see. Thanks for the reply guys. After comparison between 9350 and alpine with 9450, many recommended 9450 despite using the cable for usb.