I need to do some transcription of a jazz trio and I am looking for
software to help me in this endeavor. Can you reccomend for me the
best software out there? I use a Mac, so it must be compatible with OSX.
A suitable answer would require you to have
some experience with the software and know firsthand that it is the
best.

Hello,
I am at best an amateur musician:
learning/playing guitar for 10+ years
learning piano for 3+ years

anyway, for Transcribing music on OS X, I don't think you can beat:
Transcribe!

Information page
http://www.seventhstring.com/xscribe/download.html

Download link
http://www.seventhstring.com/xscribe/transcribe.dmg

-googleexpert

Sadly mac users aren't catered for very well in this field. The best
software to use is TablEdit ( http://www.tabledit.com/ ). It's not the
best, but it's the best for Mac. It is actually a very good peice of
software but not as good as the PC softwares available.

Hope this helps you,

Alistair