They're pretty much all the same - that is they run the same way. Internal dimensions, guts, and tuning will affect how easily they break over, but they all break over the same way. Find one that fits comfortably in your hand and at your mouth - buy it, have it tuned on the light side, and have at'r.
Calls that I've found to be especially light to break into clucks - Bay Country Shore Thing, Big Sean (either of them - I can't run them worth a damn - they break so easy that even different guts with full reeds won't work for me), Zink LM-1 or Money Maker, and numerous others.
I started out on a SR-1 - it's a good call, but runs a little differently in that the hand action is more of a cupping. This made transitioning to others calls a little more of a task at the beginning, and once I did, I couldn't stand the SR-1 anymore. I usually tell guys to avoid that call as a starter for that very reason. I prefer to set up beginning callers with something that can be tuned stiffer, but runs well tuned light - GK's, GVCC, LMC - that way you can adjust the call as you develop, and the transition to different calls is a little more natural. YMMV.
If God didn't want us to eat animals then why did He make'em outta meat?