To me the Rival S 225 on the 9" wide wheels looks a bit too stretched, an 8.5 might look better and still have enough to make them faster. They were tested on 8's and 9's and proven to be 1 second quicker on a 45 second road course which is a significant number when considering how long road race tracks are normally or a nice long canyon run(I do not endorse going all out on public roads of course) But there are not many 8.5 wheels.
The NeoGen 205 on 8's look really good, nice stretch but not to much.
If really serious about how well your car handles then always go for the best tire and wheel setup first before looks, always, then if you can get the look you wish you have have it both ways, I am quite pleased overall with my combos for their intended use but would not of minded having 8.5 for the Rival S 225 tires.
If not for running the setup I have for my summer tires I would likely want to have the 15x8 6ul and 205 Star Spec II with 7.5 tread width and low weight, great combination of attributes.
The 205 RE-71R is narrower 205 at just 7" tread width and weighs 2lbs more per tire, that is 8lbs of added unsprung rotational mass which is considerable, the tire will work well on an 8" wheel but if I had to go with 7" wide wheels I would take this over the Star Spec as a bit wide for a 7.
NONE of these tires will wear for a long time, part of what we have to live with if we can the best grip we can get, if you want a longer wearing good tire, not in the same league, the BFG Sport Compact II will work well though not as fast. There actual specs are way out there compared to sidewall markings, the 195/55/15 has a 7.7" tread width, a very wide 195 and would be great on an 8" wheel.
I have a bit better pictures I can post of the wheels and tires I have to see the bit of stretched look better but they are on my newer phone which does not talk to my computer. I have tried installing apps, fixes, whatever, Galaxy 6S, why they made that change blows my mind, a major step backwards.......I can send some if you text me though, 775-600-5718