Ok i need advice on a car stereo. pioneer deh-8400bt or JVC KD-R90bt pioneer or jvc?

i have a sony bt3800u and although it works really good with iphone via usb the sound feels like its missing something. im running 2 amps from the unit, fronts and sub but i just feel the hu is the big let down. not too keen on alpine so just wanted pointers on sound quality from high end jvc and pioneer
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