Depends on whether you count deferred policy acquisition costs as tangible or not. If yes, MET's tangible net worth is $ 13 billion higher than PRU's. And MET's market cap is $ 12 billion higher than PRU's.
But if you discount DPA, MET's and PRU's tangible net worth are almost the same.
And it looks like the government is intent on naming both MET and PRU as systemically important, which isn't good for the shareholders of either company.