Carl,
I just recently (three months ago) switched to 3 under. I have a tab as well as a skookum glove.
It's hard to describe the differences to me, but I will try. The tab that I use is a Cavelier Elite, it requires a deep hook for me to use. I will say that the release seems to be slicker, with the tab going off of the string.
With the glove, I get a much better feel of the string on my fingers, because there isn't as much between the string and my fingers. I guess that is what makes me feel like I have better control......not sure that is a good thing, because a release shouldn't be made happen, it just should occur, when the site picture is right.
Actually, I usually take both with me, and on the days that my release isn't "feeling" quite right, I shoot the tab for a few rounds, and this sometimes corrects my "thinking to much".
I have an extra tab or two lying around here somewhere, and if you would like you can have one of them to give it a go. I don't want anything for it.....just PM me your mailing address and I will get it out to you.
Just consider it a Christmas gift, from one trad brother to another.
Winterhawk1960