Mytek Brooklyn DAC+ won. A coin flip. Good enough between two good choices.
Picked up a PS Audio PerfectWave Transport, refurbished, at a good price.
All attached to my rehabbed Krell KAV300i. XLRs between all.
The Mytek folks were terrific when operator error kept me from getting music to come out. I sent them an email and my phone rang 5 minutes later. We corrected my input source to SPDIF, I un-muted the Krell, and music has been coming out ever since.
Out of the box? Call it a richer sound than my Theta ProPrime II. Violins sound woody, as do upright basses, as never before. I can hear the piano keys strike the strings. I decided that I don't like the mic Joni Mitchell used. Her voice isn't round and rich enough. But I can tell. And just think: it's going to get better.
I keep a disc on Repeat with the DAC+ on. Amplifier off. No noise, but everything should be breaking in.
Thanks for all the good advice!