I'm one that had no issues with my Note 20 Ultra Exynos version, I don't game on my phone which is the biggest problem with the Exynos 990, even at work where i have a crap signal all day battery get me though the day with over 50% left sometimes.
If i had both the Snapdragon & Exynos side by side using them as i would normally without benchmarking it, I'll be hard pressed to tell the difference other than probably battery life, which again is no biggy for me as i can easily get a day+ out of my Note 20 Ultra when at home with a good signal, as I'm not glued to my phone as some folk are.
I'm not defending Samsung in anyway I think it's crap what they done more so that both the Fold 2 & the S20 fe international versions both come with the Snapdragon 865 & Plus respectively, yet the international Note 20 Ultra wasn't given the same treatment considering this phone is very expensive.
It seems like Samsung doesn't really care anymore about the Note series instead putting all of their effort into the Fold instead, & once they find a way to get the S pen to work without destroying the screen, it's goodbye to the Note's.