Think some debates have a long life here 😁 Personally though I think the 2100 processor did at least match up relatively well. See some information here https://www.androidauthority.com/samsung-galaxy-s21-ultra-snapdragon-vs-exynos-1195066/
Members also wish to look at this thread regarding the S22
However guess some will always prefer the Snapdragon.
Whilst I am not upgrading any time soon certainly would be happy with an exynos in a future device.
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 4.0,Android 12 Official Version.