PTB – I’ve spent numerous hours searching and reading reviews on hunting releases.
First you need to decide what kind of a release that you want:
Index Finger Trigger
Thumb Trigger
Back Tension
or Resistance Activated
For hunting, I wanted to stay with what I was comfortable with and went with an index finger release called RX1 from Carter Enterprises. This release just came out this year and the reviews out there were very good. It was very similar to their Quickie release (built for a loop) but the RX1 has a magnetic hook return. I paid $125 for it and hopefully it will arrive this week. 
This is from their website:
The new Rx series of releases from Carter is the prescription for any of the hardcore bowhunters and target archers. The Rx1 and Rx2 are the new releases that were collectively inspired by World renowned hardcore Bowhunter Dr. Randy Ulmer, Champion target archer Michael Braden and were designed by Carter.
The Rx1 and Rx2 are simply the fastest, quietest and most accurate wrist strap release on the market today. The Rx series features a brand new magnetic hook return that automatically closes with a simple squeeze of the finger. This unique self closing, open hook design is perfect for trouble free shooting from a string loop, all while giving a perfect release, and unparalleled speed which has come to be expected from Carter.
The Rx series also feature the Interchangeable Tension System (I.T.S.). The system that was developed by Carter to give the ultimate trigger tensions adjustment option to the archer. With the I.T.S., regardless of your preference in trigger tension, you will be able to achieve it without adding in unwanted trigger travel. To add to the list the Rx1 and Rx2 come standard with a premium fully adjustable leather buckle strap made by Scott. These combined features enable the archer to have countless adjustment options to suit every shooting style.
The Rx2 features a reverse pivoting hook. This reverse jaw feature is very important for archers with full cheeks, beards or hunting face masks as it allows the string to exit the jaw away from the face without any interference. The Rx1 has a standard position hook that is opposite the index trigger. The Rx1 and Rx2 are both a sure bet to provide target accurate arrow flight.
Dr. Ulmer has gone on record to say that he has finally found the ultimate hunting release in the new Rx2! The Doctors orders are to take one Rx in the evening and call the taxidermist in the morning!
If I wanted a new release for target shooting, I would go with a resistance activated release called The Backstrap by Carter Enterprises It retails for around $195.
This is from their website:
Enjoy the Best of Both Worlds with the new Backstrap release from Carter. Designed after the Evolution Series, this innovative resistance activated release is fired from pulling and not punching. This is a sure fire way to overcome buck fever and target panic.
The Back Strap is specially designed for wrist strap shooters providing even less torque than hand held release aids. For a full range of pulling weight the springs can be changed by using our unique Interchangeable Tension System (I.T.S.). With the Backstrap the trigger acts as a safety and not a firing pin. The safety is depressed during the draw cycle of the bow and then released at reaching full draw. Once in the valley relax the index finger off the safety and begin pulling and building pressure on the back wall of the cam until the release fires. For safely letting down the bow the trigger can again be depressed and held down while relaxing the bow to rest. This is the best concept for struggling archers that want to learn to push and pull until the shot fires.
Another Carter release (thumb trigger) that had very good reviews was called the Chocolate Addiction
From everything that I read out there – Carter releases are considered to be the best.