How to know which node is earning the most?

I have spun up one node on each location on DO, they all seem to have defaulted to the same wallet.
No earnings as yet but once funds start flowing how can I tell which node is earning the most?

Is it purely count of relayed messages?

Yea I realize that but my question is more how to measure what each node is generating when they all feed to the one wallet?

I used multiple wallets so I could test out the “best” nodes.

Seems nodes in the EU are very unlicky with most earning 0 NKN in about 1 week.

Nodes in New York and California are going very well compared with some earning 57~ NKN

Results may not be the same for everyone but I am running 50 nodes and these are my results