I can confirm that you made the right choice.So yeah, im going to keep the 16GB and save my $250CADthanks everyone
I am a professional photographer and videographer and the M1 Mac mini with 16gb RAM is plenty enough for my needs. For intensive photo work it is absurdly fast compared to my 2017 intel i5 13" MBP. Even high demanding HDR / focus stacking photo merging runs perfectly smooth. With your M2 I bet you will be safe and happy for at least 5-6 years or even more, who knows.
Save that money for buying future external SSDs, much better investment as you may already know!