I'm excited about Ubuntu Mate OS for the Raspberry Pi 4. I am using this little powerhouse for all of my general office work and for play. It is flawless! I installed Mate in Buster so I could have a look at what's ahead. It's going to be perfect!
For fun, I installed a RGB cooling tower on my Pi4. The temps are staying at 40 C or less even under load! Here is a pic: