you will not notice it in looks. Just to have a bigger number on the side wall- not worth it. Unless you have a odd tire size, which is not very common and hard to get, if you want bigger tires, than go bigger.
The width is in mm so the width is the same. The height is in % and due to the math, 7mm more, or the way it rolls with one turn is ~4 cm more. which you don't even notice. all they do is, cost more. fuel mileage- you have it in your foot. other than that I think most is subjective feeling.
I know I will get beat up for this statement but I changed on my old truck from the odd 255/70/17 which was mounted as I bought it, to common 265/70/17, which is mathematically similar, and could not see or feel a difference at all.
If you want to know, try it and if you think you got to stick with it, stick with it, if not, go back to stock.
But I also have to say, that some tires look wider and some look tighter- but that's how the side wall bulges out. it does not affect the surface width.