It's not the tires' size that counts, it's how you use them
- It stands to reason that wider tires give you more grip. If you as a driver don't know how to take advantage of that grip, though, or if your car's suspension isn't prepared for it, you're wasting much of a great tire's potential. Think of the tires as one part of an overall system that needs to be in balance with itself. You wouldn't use a store-bought marinade packet on a prime NY strip any more than you'd pull out the fancy China for chili dogs.
But the same isn't true of wheel diameter
- Wider wheels can enable wider tires, but larger-diameter wheels very rarely provide an actual performance benefit. And that's perfectly fine. So long as you buy larger-diameter wheels for show, not performance or ride comfort, do what you want.