BMW approved use or independent

Hi all,

Very seriously considering a 2021 plate BMW M135i. I test drove one yesterday and I posted yesterday here looking for any horror stories (like those on the A35 amg).

So my next question is, is it worth paying the premium for a bmw approved used car of this sort?

My plan was to go to a trusted independent garage we have used as a family for years but just wondering what the thoughts are from those here.

Thank you 🙏