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Unless you have a turbo car I doubt it will make any difference to the average engine, but the 172 is recommended by renault to use 98ron, so who am I to argue with them.
I dont think there will be much between them - and especially if its going in an old car with knock sensors then there will be minmal performance benefits anyway. I always use the best fuel I can find, but not for tany supposed performance aspects.
Lets face it, fuel is a very low margin business. So, if you invent a super fuel and charge a premium for it, youre onto a winner. The Board and shareholders will love you and drivers of the burgeoning "sport" market are happy. Bingo.