This issue frequently recurs on this Forum, and utilising the 'Search Community' tool will provide numerous discussions from previous years. I recall that the most persuasive argument came from a retired member of a major refinery, who stated that premium fuels contain additives introduced during the refining process, whereas supermarket fuels consist of inferior byproducts. It was noted that diesel engines may reportedly operate on cooking oil.
My only knowledge is that during the initial years of our prior Evoque, I utilised retail fuel, and in 2019, I encountered a 'DPF full' problem that required a forced regeneration. Subsequently, I utilised premium fuel (first BP Ultimate, followed by Shell V-Power) and have encountered no additional issues. Given that I only drive approximately 3,000 miles annually, I consider the additional operating expenses to be a reasonable compromise.