Looks like you used the tire calculator site...
Tire size calculator
The site will also tell you the side wall heights. Remember that there will be some visual change despite the physical change. For example, a stock 245/40/19 tire changed to a new 275/35/19 tire goes from a 3.9 inch sidewall to a 3.8 inch sidewall, but there will be a lot more bulge due to how it sits on the 19x9 inch rim, and therefore may appear larger to the eye.
The rest of it is give and take, IMHO. A wider tire looks good and gives a little more contact patch, but may add rotational weight and rob some response sharpness from the handling. The differences can be minor or noticeable, so it depends on the owner/driver. Personally, my street set up isn't for eeking out the last bit of performance, so I go with big fat meats. But the track tires aren't (or won't be when I get them) as aggressive.
Hope my .02 cents helps... Good luck!