If you can get them at a local shop its better.
Why? Well i get mine at discount tire cause for the first 90 days if anything happens, they replace the tire. After that if i get a nail or a blowout, its like $60 for a brand new tire. You wont get that with tire rack will you?
And sure enough, i got a flat within the first 30 days that i bought them (yokohama s-drive). I rolled into the gas station slowly, put some air in and drove a few blocks down to discount tire. within an hour a had a brand new tire back on.