Stability: Docker engine is usually driven on the top of server or NAS device. Most used metrix docker server is unRAID.
Server is by nature more reliable and stable than usual personal computer.
24/7 usage: As server is already 24/7 in use, you don't need to let your personal computer to do the same only to run Metrix masternode or to stake coins.
Your electric usage is not affected by running Metrix masternode/stake this way.
Updates: You don't need to think about Metrix wallet updates, as this is done in background.
Only thing you need to do is to update Metrix docker (usually by one click).
And if you use unRAID server, even Metrix docker update is done automaticaly.