I had a 212j for about 10 years before I got a 720+.

The j series are so underpowered the dashboard took literal minutes to load.

The + series is extremely energy efficient, but still powerful. I was running a Plex server along with a Terraria server on it and had no hiccups.

Now they were designed nearly a decade apart, but still. The + series is the way to go, don’t get anything else if you go with Synology.