The Cayman and Tigres I believe are indentical internally. The Tigres provides the cleat on the top which on a Crealock 34 or 37 is probably not necessary with the anchor cleats that are already provided.
Defender's price on the Cayman is ~$200 less then the Tigres.
I installed the Cayman on Crazy Fish about 15 years ago, have been quite happy with it and can't say I ever missed the cleat provided by the Tigres.
You might also check with Downwind Marine in San Diego and see if they would come up with a better price then Defender.
Crazy Fish, Crealock 37, Hull 207
Crazy Fish - Maintaining, Upgrading and Sailing a Crealock 37