I think I have to go with the Xception 5.0.
I have shot very low at times with it, but that was when I was trying to get a feel for what conditions I could use it on. I was trying to push it too much when the lanes would break down or start off medium light. With the right conditions this ball can't miss. Give me some head oil and kiss the pins good night. Have thrown the ball 5 series with two 680+ a 279 and 269 (7-10 on a beautiful shot).
Heat Remake
I don't know exactly when the Heat remake was issued, but this ball is also great on medium light to light. Have shot two 279's in only a hand full of series.
Can't wait to try the Desert Heat for my second shift Friday League. Lanes are so fried that I can't keep the Heat on the lane.
I know I might be out of line, but my vote for the best Track ball of all is the Super Freak. I know absolutely nothing about drillings, but I drilled this ball to go long up 10 three years ago and have been averaging 205 - 220 since. About to drill up the extra one I was able to found NIB a couple months ago.
Track 4 life.