Is Bigger always Better?

Right now I have 255/60-15 mickey thompson et street ss drag radials. They are reaching the end of their life. I have Doctordiff offset shackle and have rolled wheel wells. With my shortened rear end I can fit a larger 275/60-15 tire without any rubbing. The 255s are 27.3 inch diameter, section width of 10.1 and tread width of 8.8 inches. The 275s are 28.2 dia. , 11.1 section width and 9.3 tread width. 8 inch rims

While obviously having more tread width will provide greater surface area for grip, is it better for street and drag strip. There must be a formula for determining what tire size is best for racing. What drive quality differences? I am not concerned about gas mileage.