^^^^^^^^;
All the brands additives are broadly similar. Those companies, Shell, Esso etc whose business is oil/gas probably have better overal systems for design, quality control etc with regard to additives. They also likely use greater volumes per gallon and have closer tolerances on their specs. So you coud argue that it is a better product with greater consistency of supply. But-----
For example, Shell, BP and Esso all have premium grades and you will find followers of each who report subjectively that their vehicle runs best on----
As to your comment about acceleration etc. Remember this is not a remap of your engine, the claims are about keeping the fuel system in best order and your engine running smoothly. Thus extracting best use of the energy available in the fuel.
I realise this is an advert but it is worth a read to understand what Shell says it is supposed to do.
https://www.shell.co.uk/motorist/v-p...-unleaded.html
p.s. Yes it will keep things cleaner than regular fuel.