If you do the math with the 275/30/19 vs the 285/35/19 for the Pilot SS and the 3.07 rear end of the SRT6.....

The 275/30/19 with the 1.5% reduction in diameter equates to an effective 3.11605 rear end.

The 285/35/19 with the 3.5% increase in diameter equates to an effective 2.96255 rear end.

The difference between the two is a not insignificant 5.2% quicker tire for the 275/30. At least on paper.

At anything above a standstill the smaller tire should make the car accelerate faster with loss of maybe 2.5 mph at the top end.

Assuming you have more than enough torque to spin either tire, the 285/35 should have a traction advantage from a standstill.