I primarily use Dell and HPs, the Majority being Dell. Dell does have some drawbacks such as needing a proprietary BOSS PCI card in order to boot from NVME but other than that, been pretty good to me. HPs can just boot off NVMEs from any PCI card off Amazon I've found. Supermicro's older hardware is meh, newer ones are ok but I heard they do some weird stuff with ipmi password and licensing.