It really depends on the type of game. If it's a latency sensitive (like a twitch FPS), UDP is the way to go. Having up to date data is more important than hav

It really depends on the type of game. If it's a latency sensitive (like a twitch FPS), UDP is the way to go. Having up to date data is more important than having all the data. If it's a synchronized game (like a turn based game or an RTS where all clients run at the same logic framerate), or not latency sensitive (an MMO like WOW), TCP is fine and probably easier.