After years of not using a Columbia Yellow Dot for spares and getting tired of missing easy corner pins, I finally bought a Brunswick Target Zone a couple of weeks ago. Since bowling in my two leagues, I've missed one spare. I use it for every spare, left, right and middle of the lane (especially necessary at my Tuesday league house, you never know what reaction you will get on spares going cross lane where it's drier). I'm very comfortable going from ball to ball on strikes and spares, so I don't see that big a difference in terms of fit...
Matt