I've used Wolftooth, old Bontrager, new Bontrager, Tranzx (old style, cable head in the lever), and Shimano.
Shimano is the slickest looking. Super low-profile, but ties with the old Bontrager 'shifter paddle' style for ease of use. Only has I-spec EV (new Shimano break style) mounting. Next, please.
Old Bontrager came on the bike. Worked okay--light, positionable, no real complaints.
TranzX was the style with a separate piece of barrel hardware in the lever for the cable. Despite this being the most 'low tech' version, it punched way above it's grade.
New Bontrager is great. Allows you to get the lever into the 'downshift' position, and is easy on the thumb, to boot.
Wolftooth still wins on the heap, largely due to the bearing design. All the others require more breakaway force, except the newer Bontrager--but that will get worse as the non-adjustable teflon bushing wears. Can be positioned pretty much anywhere due to the design.