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Seat pitch — the distance between a point on your seat and the same point on the seat in front — is the best publicly available proxy for legroom, but it varies by aircraft type even within the same airline and fare class. Exit rows and bulkhead seats often beat the advertised premium-economy pitch, sometimes for the price of a standard seat selection fee.
Before paying for an upgrade, check a seat-map site for your specific flight number and aircraft — the extra few dollars for the right seat (not just any "premium" seat) is usually the better investment.