basically, you can look at it in two aspects.

if you lower the center of gravity, then you have less to topple over.. ie less body roll. that goes for springs, and coil overs. benefit of the coil overs is this aspect is adjustable height.

The dampening adjustment is "Sort of" like a deflection range. How much you want to let the suspension move when it moves.
if the inside corner on a turn, you can have it adjusted to it "how much" it will allow that corner of the car to drop (more specifically how fast, for the duration or to outlast the turn). the opposite side will raise in correlation to the drop of the other side.. So the less it drops the less it will raise the other side= less body roll. plus, if you can adjust how fas the other side will raise up. you get more control.

wheels sizes don't matter as much as tires, if you run a 195/50 whether r15 or r16, it will have the same side wall but more/less rolling diameter. but if you were doing a 195/50r15 versus a 205/40r16, then yes sidewall is very different.