there is a book published with bass in mind "
JS Bach for Bass."
it includes both notation and tabz!
best of both worlds? even though that is a matter of opinion (and ours slants toward the "conservative"-tabs are bad), the tabs are sometimes unhelpful.
I play two (partita no. 3 in E and...um...another one!), and i noticed that the tab for the former had some bad "suggestions." It was easier to play certain notes on a different string/fret rather than what the tabs read.
If you get really serious into it, I would suggest taking lessons from a qualified teacher. My left hand technique dramatically improved from playing Bach, mostly due to the fingering (...) my teacher demonstrated to me.