I am not sure the two schools bear much comparison to each other.
Older style players had an intuition which I am not sure is matched in today's game. But, they cannot beat either the volume or studying that comprises the modern game. The modern players are unquestionably technically more sound.
Citing Negreanu as a player who spans both does not cut it for me. Negreanu does not compete regularly at the highest levels because he knows his game will not stand up to that competition. He picks and chooses where and when he plays outside of the
wsop which is smart and plus EV.
If looking for someone who still competes at the highest level after decades playing I would nominate Erik Seidel. That said even he has dialed his schedule back and has been quite open about looking ahead to the possibility the newer generation will so regularly outplay him he might withdraw from the high rollers completely.
Apart from Seidel, the only other I would pose as being truly competitive from the old school is Phil Ivey. He has a heady mixture of intuition and degen gambler. When on a roll he is fearless.
All that said, I honestly think old school does not hold a candle to new school, but this does not mean old school is without merit.