B4J Question Any recommendation for what to look for in a Raspberry Pi Case?

[Diceman]

I have a a couple of RPi 4b 2GB & 4GB and want to know what to look for when buying a case for it.
Do I need a fan? My 4GB RPi has a fan but the 2GB doesn't.
Do I need a case with heatsinks?
Should I look for a case that is all plastic or look for one that has part aluminum?
What about the FLIRC Raspberry Pi 4 case? Any good?

TIA