When I switched to android for a year, it was one of the reasons I switched back.
When all your friends have iPhones, groups texts get kind of nasty when you add an android to the mix, and I don't want to be the one who causes the green bubbles). Things like "a friend has hearted the message "blah blah" " ... it's just kinda gross.
Plus, you can't sent a high def video from an iPhone to Android using iMessage. You HAVE to use something like whatsapp or something, otherwise the video gets downconverted to a postage stamp size. And if just 1 person in a group chat has android, then EVERYONE gets the postage stamp size. It's actually pretty annoying.