It was a good while back that I had the empress so I’m not 100% sure, but for hall, room and plate sounds I really love the Bam. All the algorithms are spot on for me. Fewer of them, but they all hit the mark.
I see the Empress more as a high end guitar pedal that can comfortably be used as a send/return, and the Bam more as a studio unit competing with rack-mounted stuff but that can double as a pedal if you wanted it to.
Knowing your setup and saying you’d use it as a send/return, I can see it being right up your street.
Expensive outlay either way though, so if you’re able to try before you buy it might be worth it.