Since full blocks are full blocks (put that aside from the UTXO set increase)... If full blocks are full of 'data' with fewer and higher-fee transactions... Or with less data ut more smaller transactions that add up to a similar total block reward...

They're both the same from a node's perspective right?

Full blocks of monetary usage take storage. Full blocks of 'data' also take storage. So... what's the difference from the node's perspective?

It's all data storage. I say let the "most valuable" blockspace economics win...