My two cents ...
I do like the stiffness of the 6 or 8 ply tires, but I also like the look of low profile tires.
Right now I run P235/60R14's. A lil softer ride, but smaller side walls help with side way sway.
15 or 16 wheels would have even stiffer side walls, creating even less sway. Just keep over all tire circumference the same, at least very close.
Only problem I've run into is, finding shops that will mount the tires. Some shops will only put on what was recommended , in the 70's. My argument is, technology has changed a lot since then.
I brlieve 8 ply Michelins carry 1800 lbs per tire, and my sport passengers carry 1600 lbs. nit a big difference ...
If your staying stock, for a smoother quieter ride, Michelin.
Ok ok, it was a lil more than 2 cents, lol