A rpi pulls ~5w (little more I think). These desktops pull 35w at full utilization with a cpu 5 times more powerful. An old laptop might be 65w or even 90w but would still outperform the pi with ease while giving you a battery backup along side a built in mouse and keyboard for convenience. Plus upgradability as far as ram goes.
But what good is sipping power when they regularly go down? I’d rather spend a tad more to have reliability.
I’m out of Chicago. I just had 2 plebs pick up desktops at our bitdevs, where I brought in HP Elitedesk 800 G3’s, HP Probook 450 G3’s, & Intel NUCs to showcase tradeoffs between hardware choices.