If you want to get the jargon down, split finger is the Mediterranean release. 3-under is called the Apache release. Don't ask me why, 'cuz neither one makes the slightest bit of sense to me either.
I shoot 3-under a lot with my compounds and I've treally tried to make the switch to it for my stickbows because it doesn't hurt my arthritic fingers nearly as much. It's hard to make the change after so many years...[&:]