Just to share my experience, few days ago Waydroid stopped to work for me with my Pixel 3a on 16.04 Stable channel. I was then forced to pass to 20.04, since I still need to have whatsapp in some ways available. I thought that upgrating from within the OS itself straight to 20.04 it would have been a good idea, avoiding using the Ubports installed but it was a great pain instead; it upgraded to 20.04 but OS resulted severely broken. In fact any kind of gesture I was used to was slower and unresponsive most of the time. Phone storage was awfully clogged, 60 GB nearly full for no apparent reason like if the new OS installed along with the old one. Subsequently, I decided to employ the Ubports installer without selecting the wipe option in order to preserve my data but it never ended the process, after many attempts with different usb cables (at least 5 cables I tried). There was no way to resurrect the phone, therefore in the end I was obliged to try to install by means of the Ubports installer but this time tapping on the wipe tick, to install from scratch. It worked flawless and now I'm on Focal 20.04. Unfortunately I lost some of my data, but luckily I was wise enough to backup at least my personal videos and pictures. The new environment seems much snappier than before, but I'll report my experience on that in a few days to get used to it.