If i had the choice of SD over Exynos without having to import and forego any warranty i'd go SD. However, I don't have an issue with the Exynos s10e I currently use. Could it be better? Probably, but my use case doesn't mean I need the extra 10/20% performance, and I don't really run into any issues of running out of battery either.
Everything else works the same as any other phone bought in the UK. Your age doesn't even factor into the equation! You either save £150 or more importing a more powerful and efficient model with the only downside being you don't get UK warranty, or you buy the UK version with the downside being a bit worse battery life and a higher cost.
