I'll start with Beyer T1.2 (shown in picture). Will take me several days to complete. I am also comparing to the Lyr 3 that I've had for a while and I'm familiar with. Ultimately, only one will survive
I already played the modded with the Modius (no pun intended) and I think the Modius was restricting and muddying the modded LP. Modius is up for sale and someone claimed it already. Admittedly, I didn't test it much, but since I decided to sell the Lyr 3, or the modded LP, whichever one is better, the Bifrost 2 will be the only DAC I need.
I have some other factors affecting my decision, though, so full disclosure: Other than the cans I own, music tastes, ears etc., I also own a Mjolnir 2, so the LP would be sharing the many pairs of 6922 variants I got from Wes. If I keep the Lyr 3, I'll need to maintain an arsenal of 6SN7s (which I also got from Wes btw). Sooooo, all else being equal, I'd keep the modded LP.
I don't want to post much before I'm finished, probably next week, but man, I can say I am impressed with the modded LP. I have not played with the LP much in order to determine if it's the mods or the LP, but I am impressed nonetheless. My other two amps are a MJ2 and a WA5-LE, so it's not like I don't know what quality sounds like.
Comparisons are a very lengthy process for me. I don't do A/B. I have to play the different combos for several days to get accustomed to the sound, try different headphones or tubes perhaps, but definitely train my ears to the sound. I also like a variety of music, so I have to spend quite some time to go through. In the end, whatever leaves the best impression to me will be a keeper. But I don't plug/unplug constantly.
Hopefully, my impressions will be helpful to the good folks here.