Ok it really depends on the exact building, mic, and how quiet the source is.
"And the powered mic is good, but for loud brass its not needed. You probably won't be adding much gain on your pre anyway. Maybe if you were doing a brass quintet they would work well. really a more distant type of mic by design, but has a different type of transformer so the sound overall and the low end are different. "
How is the sound different, can you describe it a little?