I usually find that my triangle takes up most of the low end.
You have a bass triangle!?
For me, speaking in generalities:
Most rock forms the bass gets priority in the low end.
Electronica - the kick is usually the dominant low end, but there's a lot of competition, usually some tricky harmonic stuff and ducking to make both seem prominent.
Modern Hip Hop - the kick. Usually.
Older Hip Hop/Underground - the bass. Really, there's just tons of low end all around.
Neo-Classical - tuba, timpani, bass, bassoon, it all blends together. Unless there's a solo.
Chiptune - it's all 8-bit so there's really not much in the way of low end. (ok, just threw that one in for kicks.... ick... terrible pun).
Jazz - bass. though it gets a little dicey for that Brad Mehldau or Medeski/Martin/Wood style of jazz.
Soul/Funk/Disco - usually the bass.