Thanks for your insight and the information!
It does make a lot of sense that the decision of which type of horn to play really depends on the genre of music you are going to play. Of course for me, the decision of what tuba to play depended heavily on PRICE... BBb tubas are, "a dime a dozen", so picking one up that I could afford was a lot easier.
Being in a community wind ensemble, the sound and texture that I can produce on my BBb suits the types of pieces we play very well. It has a very large bore and although sometimes I feel like I'll need an air compressor to get through some songs, it's rich and velvety sound anchors chords nicely.
For now, I suppose I'll stick to the BBb and experiment with different bore sizes until I'm ready to "expand my horizons". Maybe a 3/4 horn is in my future...