we need both/many
I've used both iOS and Android. I find I prefer Android and have chosen that for my newer devices (though I still use a Mac). That doesn't mean I want Android to be dominant. I'm glad others are using iOS, W8, BB, whatever. We've all seen what happens when a technology becomes excessively dominant: Consumers lose. I think some people are just insecure and want the validation of the masses for their purchasing decision.
I view it like my dSLR. I've chosen Canon but I have respect for Nikon (and others) because they make great stuff, sometimes better. I've always said, great Nikons make for better Canons.
Let others make a different choice then you. Be happy someone did. It's ok to argue about which is best, but remember that you only have opinions and not absolute facts.