I'm very late to this party. Tim is a great guy with a nice car too! He mentioned some good points, especially regarding the camber curves. I have some comparison photos on my phone I can add. You will never get an apples/apples comparison. Its like saying my new tires are better than my old ones.
I think the things to take home here are people like a clean bolt in solution with all new parts, regardless of what they do. Others are happy with getting dirty and doing modifications.
In terms of performance, the tires don't care where they get their angles or spring rate from. Excellent performance can be achieve many ways these days.
The things I like about my t bar setup is a good ride, turning radius and suspension travel. My setup uses delrin bushings which last almost forever. The room for tires is huge with 18s. I've run a 275 on the front pretty easily. My on center feel is excellent and the on center tracking is easily as good and my modern cars. The tires remain square throughout the turns maximizing the contact patch. I realize most won't go through the lengths I have to setup and refine like I have, but the results are impressive.
For anyone looking to compare lap times, that's another story entirely. Driving skill and tires are very big factors. Personally, I'm not the greatest driver, and I like to run tires I can use in any temp. Currently running Michelin Pilot Super Sports. 320 TW.
The biggest take away is be thankful there are options. I started navigating handling improvements in 1985, when it was just a joke..
