There are iOS-exclusive games and Android-exclusive games. Are there Windows Phone-exclusive games yet?
Apart from games, Android has AIDE, a Java IDE that works on a tablet with a Bluetooth keyboard. I haven't tried it on an Android phone, but I'm guessing it might work on a phone with a Bluetooth keyboard and an HDMI output when the touch screen emulates a trackpad. Does Windows RT have anything like Visual Studio, Eclipse, or anything else to develop apps on the device? Does Windows Phone even support HDMI out? Instead of HDMI out, Nokia phones have DLNA streaming, which apparently has too much latency for actual interactive use because it's designed for movies, not apps or games.