Less understeer, with all other things being equal, usually means less overall grip. But if the balance is better it can be a lot less frustrating and easier to drive quickly when the car doesn't want to push. I don't doubt that they handle heat better and have stiffer sidewalls but I suspect the Vreds probably don't pull quite as much lateral G. But if the PS2's won't do more than a few good laps before going off or chunking, it's definitely not worth the extra grip!
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