AB level matched testing will highlight immediate differences, long term listening will highlight preferences as to whether those differences are good or not for your taste etc.

There is a kicker to all this, even if there are NO differences and you actually believe there are, you WILL hear that difference i.e. it will be a truism to you.

Roon/Tidal, SBT, Trinnov ST2 , Twin Devialet D premiers, Vivid Audio Giya G1 Spirits, dedicated and treated room.
Meridian gear: 568.2mm and DSP5000's acting as TV speakers.