Consider the Legacy 3-under. It has a longer piece of leather for my middle finger, for more shooting comfort.
I have two Bateman 3-under tabs, and they worked well and are durable, but they left the tip of my middle finger (last 3/8"?) exposed, and I'd get a bowstring bone bruise on my middle finger after a long shooting session (yes, I'm keeping my elbow down).
The Legacy 3-Under is MUCH more comfortable to shoot. All smiles from my middle finger with using the Legacy. I use "medium" size, but got the large (an experiment) and needed to trim/grind it down to have it fit "just right." Easy peasy, and I'm happy with the result.
My next 3-under tab will be another Legacy, "medium" and not a Bateman, just due to the middle finger tip protection the Legacy design offers
http://www.lancasterarchery.com/legacy-leather-3-under-double-layer-finger-tab.html