(1) Do you hunt Geocaches, BM's or Both.
I do both... It depends on my mood... For some reason, though, I prefer BM hunting because not only is it fun, to me it feels useful... Sort of like voluntary community service.
(2) If you do hunt BM's, do you log with GC.com, the NGS, or both?
I log on both sites... All of my finds are logged on GC.com. On NGS, I log everything except BMs that have been recovered within the last three years and don't need description updates.