I try to find quality used ELP records in the bins and that is so tough. Almost all ELP used I have bought or seen is in bad condition, barely VG and more like Good at best.
That's especially true with original release Cotillion. That Trilogy I played was a 1977 reissue on Atlantic, it is VG++ at least.
No loser here...although I feel the B1 has a tad more sharpness vs the B3 side. Splitting hairs though.
I had the same results with some identical albums this week. Couldn't really pick one over the other so I selected the one with the better cover.