I think you start from the wrong approach, looking into hardware first...
The most important question you should start with is : WHAT IS THE PURPOSE of that LN node?
There are many ways, modes, types of LN nodes and each one have its own type of setup and hardware.
You have:
learning nodes, that can be a shity RPi
developing nodes, that also can be a RPi or a could node (temporary)
routing node, if you want serious business, run a serious server not a shity RPi
playing around, but stable node, use a NUC with strong hardware
private node, personal use - you don't really need a desktop machine, nowadays you have full mobile nodes, enough for running your private LN payments.
I think you start from the wrong approach, looking into hardware first...
The most important question you should start with is : WHAT IS THE PURPOSE of that LN node?
There are many ways, modes, types of LN nodes and each one have its own type of setup and hardware.
You have:
All is up to you what you want to do.
Here I wrote also dedicated guides about running nodes and hardware:
https://darthcoin.substack.com/p/lightning-node-maintenance
https://darthcoin.substack.com/p/recommendations-for-ln-users
https://darthcoin.substack.com/p/lightning-routing-fees-experiment
https://darthcoin.substack.com/p/bitcoin-private-banks-over-lightning