Comparing Nixon's corruption to Trump's, one has to look at the contrasts, not just the comparisons.
Fareed Zakaria on his program this morning offered some insight. Essentially Nixon had a more influential cabinet around him. They successfully refused some of Nixon's drunken and/or more corrupt orders. Nixon understood politics, he understood the job, he was competent.
Trump's presidency is framed around his narcissism. He is irrational and incompetent all the time instead of just when he is drunk. He has surrounded himself with people who cannot intervene, if they could, Trump wouldn't have them around him in the first place.
It's hard to compare the two men.
Then you have to look at the Republican Congress and other aspects of Trump's Cabinet. There was no massacre on Tuesday because no one resigned in protest of Comey's firing. The Republicans in Congress are in denial, perhaps also believing the Russia mess will go away the same way Trump thinks he can fire the people who keep looking into it. Perhaps they don't care as long as they believe they can accomplish their own goals.
Nixon spied on his political enemies. Trump is trying to quash enemies (real or perceived) who are looking into Trump's criminal acts. Nixon's goal was always political power. Trump's goal is adulation of himself.
Which is worse? It depends on what you measure by: Corruption resulting in personal financial gain (Trump) or political gain (Nixon)? 55,000 American deaths in Vietnam, for nothing? Breakdown of our democratic processes?
Bernstein is weighing in on CNN that the breakdown of democracy is more dangerous. Given the additional problems, we are in the era of unreliable information, people are even more gullible, marketing techniques are more sophisticated, he may be right.