I don't have an iPhone and I don't really use text messages with anyone that does, so I can't speak first hand. But teenage bullying and status symbols / materialistic people aside, my understanding is that the big blue bubble / green bubble thing is group chats and photos and videos. Group chats "just work" via iMessage where as they can be strange via SMS, and photos and videos end up compressed and ugly via SMS.
If you don't group chat or send and receive photos or videos, then yeah, it probably makes zero difference. But e.g. for a family with a new baby, I think I'd be pretty upset if I was the Android user in the sea of iPhones and the baby photos group chat was janky and gave me 10x10 pixel photos.
If you don't group chat or send and receive photos or videos, then yeah, it probably makes zero difference. But e.g. for a family with a new baby, I think I'd be pretty upset if I was the Android user in the sea of iPhones and the baby photos group chat was janky and gave me 10x10 pixel photos.