I recommend enumerating what specifically you want to run on the server and then acquire hardware sized accordingly.

Raspberry pi is fine for just a few things like Bitcoin, Electrum Server, Lightning and a Block Explorer.

When you start adding much more memory and CPU intensive apps you'll run into performance bottlenecks.

The same will go for Umbrel Home. You cant run all the apps it makes available just as you wouldnt be able to do on any hardware.

Support from Umbrel is still coming up short, so buying the Umbrel Home device is really making a significant donation to that company to keep building products. You can get the same (or better) specced hardware for cheaper elsewhere