in case one is partial to flats. here's a quick and dirty list
EBMM Cobalts - big sound, perfect tension, sound closer to rounds but easier on the fingees
EBMM Group IIs or IIIs (still out there) - more traditional flat, see Labellas, good value
TIs - boutique flats, spendy, very low tension, super comfy, good tone
Chromes - high tension, not for me
Labella Deep Talkin - traditional flat, easiest route to the Motown Jamerson sound
Labella Flexible Flats - feel like TIs for less $
Sadowsky Blue Labels - higher output, much like the Cobalts, and perfect tension (for moi)
Fender Flats - a good value flat
DR Legends - much like Labellas, don't come in "light" gauge (that I recall). thumpy
GHS Precision Flats - too thumpy, compressed, for my liking
as always, YMMV