I just bowled this weekend, and from my view it appeared that a little less flare and core worked better. I had a Taboo and a Pure Physics that just didn't pick the lane up at all in practice, but when I switched on the last ball and tried my pin down Hyroad it read the mid and made a great downlane move. My teammates noticed the same thing in that slightly weaker cores and covers were better.
That being said in the track line I would favor the 505 balls. I wouldn't say one in particular, as the layout and surface prep matched up with your ballspeed.
Little known fact: In Russian "Hope" and "Change" translate to "Tax" and "Spend"