I really like the sound of the Ampeg ... very warm with a nice overdrive when you push it.How does the Ampeg sound on the Bruce cab? Bruce amp on the Ampeg cab?
The Bruce has a sound similar to an Ampeg - whatever magic an Ampeg has that makes the sound "round" the Bruce amp has about 75% of that same voodoo.
Since they are rehearsal amps, either one would serve the purpose.
I'm leaning towards keeping the Ampeg B25B, only because if either one stops working, I'm much more likely to get it repaired locally (if fixed at all) than the Bruce. Plus, with companies like Fliptops and resources like Talkbass, there is a network supplies and knowledge about Ampeg. But I'm still considering the pros and cons of holding on to the Bruce.