Well, if you are going to write exactly the same thing for both posts and just switch the word "android" with "iOS" don't bother. In that case, you'd be better off writing an article that outlined the games you could play on both devices.

If there are device-specific games, you could ALSO write two more articles - one for just Android-specific games and one for iOS-specific games. Then, at the bottom of your original "both devices" article, say some thing like ... "Wait there's more! Not every multiplayer game can be played on both devices. Here are some great multiplayer games that can only be played on Android devices [link to article] and we've got another article that shows the multiplayer games just for iOS [link]."