External lps and internal dc power supplies, in my case Uptone MMK and JS-2. Jitter is only part of the problem with using the usb out, noise on motherboard, especially with stock power supply and no OS optimization.
This is why I'd bet on RP device to be superior to stock mini, RP simpler, quieter than mini. Getting mini to good server status require decent outlay of cash and pretty good diy skills. RP devices are plentiful and relatively cheap.
I'm a modder and diy, so modded mini is right up my alley. If not into this and want to spend some cash, many good off the shelf servers, streamers in similar price range of modded mini.