So exactly the same as if you somehow acquired 10% of the total supply of a capped PoW coin...
There's difference between owning a trillion dollars in cash and owning the FED's printing machine
with a trillion dollars. With the latter you exert much more influence to everyone who's using the currency. Let alone, you vote against the collective carryout of the transactions.
Apparently you forget what we are discussing here yourself. We aren't just comparing computational cost. We are comparing all values at the same time.
Isn't computational cost part of "all values"? From my understanding, we can't divide the "PoW Produced (24h)" with hashrate to find which one has the most effort, because of different hashing algorithms.