D-Sonic amp vs Halo A31

I am struggling to decide between Halo A31 vs D-Sonic amp. I need 6 channels of amp. My main question is sound quality . Has anyone heard either Halo A21 or A31 and compared it to D-Sonic amp? Restocking fee is high for D-Sonic amp so I would really appreciate it if anyone can provide some input. Sounds like Halo A21 and A31 are very good amps but D-Sonic also got very excellent reviews. I did like Nuforce reference amp but it sounded edgy at times.D-Sonic appears to be far better in sound quality from what I have read. Thanks in advance.