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The Curious Bag
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<h4 class="dechead">On One Hand: Thumb Releases are Steadier
A thumb release is the most common kind and always offers a steady release, while a finger release is much more touchy. If a shooter using a finger release gets nervous ("target panic"), jerks on the trigger or simply isn't disciplined, you can count on a misfire. A thumb release can't be jerked.
On the Other: Hunters Prefer Finger Releases
While finger releases are typically not recommended for target competitions, many hunters prefer them. This might be because they started with this type of release and don't have to worry about unsteadiness, or it might be because a finger release is much more like shooting a rifle, thus offering a more authentic hunting experience.
Bottom Line
There is no better release, which is why both thumb and finger releases remain in use. Many experts recommend using whatever method you're comfortable with at first, so as to build your archery muscles and get an overall idea of how to fire an arrow. After that, if you need more steadiness, use a thumb release. If you like the feel of "shooting," use a finger release.
Source:
Archery Talk: Teach Me About Releases
Kleanthes Koniaris: Mechanical Release Devices and the Compound Bow
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