A21 vs McCormack?

@cheeg  I have a recently rebuilt DNA-1 Gold Special and it is fabulous.  I have no experience with Parasound but know from talking with Steve McCormack that much of the circuit improvements he employs in his rebuilds now were realized based on his building cost no object amps. for some well-heeled customers.  As most great audio designers do, Steve took stock of what he learned in those extreme efforts and trickled those ideas down to the SMc Audio upgrades.  Incredible value, incredible music!

I will also recommend McCormack and SMcAudio, as the work they have done for me is beyond reproach.
I have no knowledge of Parasound, but have known the brand to be of very good quality.
The question is what are the other components of your system?
I hate the trite term 'synergy', but it really does come into play.
Bob

My DNA 0.5 is the only piece of gear I've regretted selling.Nothing against parasound, but the McCormack have a following for a reason.

Thanks for your responses — Bob, the rest of my system is:
Usher Mini Dancer 2’s
DNA-1 
Parasound 2100 preamp
Benchmark 1 DAC
Bluenote Vault
Cambridge CXU
Technics SL-D2 (rarely used)

I was planning to upgrade the DNA-1, but the recent cost drop of A-21’s, due to the release of the A-21+, made me wonder if that would be a more cost-effective choice for an amp of similar quality. I’m surprised no one has spoken up for the A-21’s, as they were John Curl design and I had heard they were very, very good. I’ve been very happy with my McCormack, and have heard SMC does a great job with the upgrade, but before spending $2K I wanted to be sure I wasn’t overlooking a great, lower cost alternative.