I was going to say I always try and shoot the highest possible score. After thinking about the question though, I had to stop and think.
It really depends on the situation. Bear in mind, my objective is to win the game. Let's say we're in the 8-9-10th frame, match is close, and I've lost my carry. In a tight match, I usually do not change balls or try a different line to get the carry back. I'd rather have the makeable spare than take a chance on leaving a split or washout and hand the game over to the other team.
On the other hand, being anchor, if the game is already won or is out of reach, I will use the 10th frame to try and find something for the next game.
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~~~SrK - Have balls, will travel
Spending the kids inheritance one tournament at a time.