Wait for a better version that fully supports the pi4 4gb. Rasbian is doing a good job. No more buggy ubuntu for me for a while. I lost a lot of time and when I thought it works... something went wrong, like xrdp or hanging up. Anyway, ubuntu works on the pi4 like windows millenium on a PC:

I tried almost all images for the pi 4. Ubuntu, x, k, l, mate and others. Only rasbian is stable and accessible through ssh and xdrp without f.. around. I use .net core to play with gpio and more. It works like a charm. Yeah, only on rasbian. I will trie to give it another shot with ubuntu and other...

You can use something like velocitydb. Take a .net compatible object db.