@lalitk Most of these comparisons were completed on my reference system over the last 2-3 years, which is pretty much up to date on my virtual systems page, aside from additional accessories and tweaks that have been added since:
https://www.audiogon.com/systems/11410
DACs used are primarily the T+A SDV 3100 HV and the T+A DAC 200.
With the analog output series, I tested all A200, A15, A20 and A30 all with their DACs to preamps as well as DACs as preamps going straight into the amplifier.
Other amplifiers I swap in from time to time are Cambridge Audio EDGE M monoblocks, the T+A S10 Hybrid Tube Stereo Amplifier, and the T+A R 2500 R and Aurender AP20 all in ones. I have a few others on the floor, but they don't nearly get as much play time.