Pass Labs make some great amps, but if you are looking for a quality multi-channel amp, you really should also consider the Theta Digital Dreadnaught II.
Since you are only asking about those two amps, I will have to go with the Pass Labs. It is a good amp, but the technology (compared to newer Pass Labs amps) is a little dated. With that in mind I still think it is better than the Proceed. The Proceed is another good product but not in the same league, in my experience.