@bumi worked on this for Phoenixd (https://github.com/getAlby/hub/blob/master/scripts/linux-x86_64/phoenixd/README.md) and there is also a dedicated Alby Hub Phoenixd for Umbrel. For LND, this is already the case for Umbrel and Start9 and is the default install. Start9 will also support picking between LND and LDK at startup without having to configure anything else.

But yes, we would recommend the default backend (LDK) for most people unless they already have a lightning node.