I have the Note 10 and ordered the smaller S20. The screen is only slightly smaller on the S20 but narrower and feels better in the hand to me compared to the Note 10. Other reasons I'm upgrading:
Better processor
More RAM
Better cameras (at least on paper, will see)
Buttons on right side on the S20( Note 10 buttons being on the left drives me nuts)
Better screen(refresh rate and resolution)
Expandable storage
Bigger battery
5G
After all the trade in and discounts, it will cost me about $300 out the door which isn't bad and I will get the $135 in Samsung credit. So seems like a lot of good upgrades for what it will cost me.