Unless I'm playing in a tournament, whenever I'm dropping money into a game my goals are:
1.) Replay score
2.) Top Scores
Sometimes if I'm playing on free play or have accumulated a pile of credits I might focus on something I'm having difficulty with or just pick something to try to blow up. Or if I've got a bunch of credits on MM I'll go for Barnyard Multiball, which for whatever reason is one of my favorite things in all of pinball.