Any of the Truball thimb releases are good but get one with the Talon head not the caliper.

Another good one is the Carter Ember it is new from them this year, my shooting partner has one and let me test it all I can say is very impressive

Another one I like is the Magteck thumb release but I am not sure if Ken has anyone to make them now.
They dont have any springs in the but magnets instead which gives you that surprise release cause you just dont know when the magnets are going to break over.