I work for a company in oil & gas. One of our main customers is Shell UK, mainly Shell Stanlow. I'm no expert on fuel by any means but have spoken to a few of the chemists at Shell Stanlow in the past, according to them, the additives in V-Power are far more advanced than any other Super unleaded. There are various tanker filling points down there (Tesco, sainsbury's, BP etc). They all use the base petrol that has been refined at Shell Stanlow. The only difference is that at the point of filling the tanker, the company have a seperate tank which adds their own additive to the base fuel. So the only difference in the fuels are the additives.
Personally I only use V-Power in my car as I find my car does run better on it. But there is a obviously a mixed opinion on which fuel is best, so its each to their own. Experiment with a few different fuels in your car and then stick with whats best for you.....................