was talking about this with someone on here the other day, if you want to look at my replies to see that thread.

I've heard good things about start9, seems very similar to umbrel.

I wouldn't recommend running a lightning routing node on an rpi4, mine usually needs to be rebooted every week/every other week.

if you want to run a node and run a mempool instance, I'd say go for it! if you want to route LN or just a more reliable node, I'd suggest a slightly more powerful PC. like a dell optiplex or an optiplex thin client, or a middle 2010s laptop.