You really do not give enough information for a valid comment on either engine.

But I will say this, fuel consumption and an RB are like water and oil, it'll suck regardless of which one you chose.

Carolina Machine Engines lists 5 different 440's and 4 different 522's.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.