Adcom GFA-5802 -vs- Parasound HCA-3500 Amps?

I have had both these amplifiers in my system for more than a decade.  They're both great amps.  In my opinion the Parasound is a bit higher end and more powerful, able to drive difficult loads.  But they both have a Class A/AB design and more headroom than most will need.  They're awesome amps for the money.  You can't go wrong with either.  Note that the Parasound is massive.  You need a deep rack to hold it, and it weighs 100 lbs.  You really need two people to move it, so if WAF is an issue consider that.