My parents have a sun room that's about 14 by 14 feet whose ceiling is shaped like a triangle, so the room has a pentagon shape, like a barn or cathedral whose ceiling tapers up. The doorway's pretty wide though and opens into an uncarpeted kitchen. The apex of the triangular ceiling is about 12 or 13 feet. Problem is that it's all carpeted. I'm thinking it'll sound nicer recording in that rather than my 10 by 12 foot bedroom that's totally rectangular and has a very small doorway?
I also have a foyer that has a really high ceiling, maybe 17 feet or so, not carpeted but rectangular. What's more important: high ceiling, non-carpeted, wide room dimensions, or the shape of the ceiling? Ah, I guess you can't really give me advice without me taking some pictures. Plus, I'll probably try each place and see what sounds the best anyway. Maybe I'll upload some pictures later. I'll figure this out by trial and error.