I hate ATX psu`s, they are bulky, heavy, expensive. PICO is microscopic compared to ATX.
Yeah, and it also blows up when overloaded and takes the mobo with it. No thanks.
That's why I only use ATX to power low power components (MOBO, CPU, SSD, fans).
The only problem with PICO can be a MOBO that won't POST with 12.5 volts that most server PSUs provide. There was a topic on this forum not so long ago where someone had a non POSTing miner because of that.
But PICO is usually the best way to go (save some money and space
)!