Whilst Snapdragon processors were regarded as superior the advantage according to many experts less pronounced with the current 2100 Exynos processor. See more here https://www.google.co.uk/amp/s/m.gsmarena.com/exynos_2100_vs_snapdragon_888_sustained_performance_an...
My own personal experience was with the Samsung Note 20 Ultra.
I first purchased the Exynos version from Samsung UK but had to send it back because of some issues involving network connection.
I then imported the SnapDragon version from Hong Kong and the difference was night and day.
In my own personal experience the SnapDragon version optimised better ranging from general usage and in regards to the battery.
The Exynos version could struggle.
It seems Samsung have taken note of this and have started releasing new phones with the SnapDragon soc in them. Whether this will happen with all flagship phones I'm unsure.
However my Fold 3 purchased from Samsung UK does have the SnapDragon chipset in it.
All that said my son has the Uk version of the Samsung Galaxy s21 Ultra and he has nothing but praise for his phone.
Current Phone > Samsung Z Fold³ 5G.
@ELLIFEAR I have also been very happy with the Exynos S21 Ultra ,though experiences on the community seem to vary.