I personally wouldn't give up my Note 20 Ultra for the flip 3. I have both and was supposed to do a trade in my N20U but decided against it.
Battery life is so much better on the N20U. Just doing basic things on the flip 3 I can clearly see the drain.
I think the cameras are pretty comparable minus the front facing on the Flip 3. I would have hoped for a faster shutter on the flip but moving targets are still difficult to catch.
The display is for sure nicer on the Flip 3 compared to my N20U! Everything really pops on this phone where colors seem a bit more muted on my N20U. Size wise I think it takes some adjusting coming for the N20U to the Flip 3. The flip is much more narrow and tall. Holding it while open makes it feel fragile compared to the N20U.
I've also noticed, it could just be my device, but signal strength is much better on my N20U than the flip3 indoors
I absolutely love the portability of my Flip 3 and flipping it open still feels amazing. When I've reached hand fatigue using the note a switch over to my flip 3. If you watch a lot of videos and decide on the flip 3 be prepared to charge frequently.