I'm a doctor, not a phone technologist!

But on Android, you can replace the default messaging app, and that app can have access to SMS as a fallback, so it's really easy to convince people to switch. "Hey, uh, plain messaging is annoying some of us, please install this app, we can all use it, but it will work even with people who don't have it over the regular text service."

Can't do that on iOS.