Different car models, different years, and crappy 3rd party cheap replacements. You don't want to standardize on a
system, because that can constrain a manufacturer from doing something unique with the windshield. Or even stop innovation completely to come up with an even better system.
What I've found, is that all systems are actually really simple. The biggest problem (and pain) is buying "compatible with" wipers that are designed to mount multiple cars...poorly... rather than a single car, very well.
Get your wipers from the dealer. They will snap on and off with ease, actually aren't that expensive, and you'll wonder why you've been bothering with RAINX or whatever for all these years.