Being out of position is an argument for pushing, since it neutralizes Villain's positional advantage. Your goal here should be to get as many chips in the pot as possible. If you think he will almost certainly fold to a push but will make a continuation bet, then you can call and check-raise all-in on the flop. But I like pushing, as it gets the money in when you are almost certainly the favorite and gives Villain an excuse to put you on a steal.