Competitively - ill hit wherever I am most likely to win the point. It's on the opponent to defend it, not my problem. They need to adjust, not me.
Friendly practice - ill give my buddies a heads up. "dude, I'll probably crush Jim's second serve if it's on my forehand. Be ready."
Socially - ill hit wherever the most conservative option is. If the players are decent enough, I may go alley once or twice. Probably just going to slice back most returns cross court.