I'd probably side with the Gold bugs if I was alive during that election cycle. Just from a historic standpoint the gold standard has been more widely used and reliable. Though I see the Silverite's point with it being more abundant it's easier to expand the money supply as the economy grows. On the other hand with how abundant silver is it has less stability than gold as it has more practical uses than gold which could deter investments. So I'd be voting McKinley.
Richard Nixon, while definitely and uncommon choice I've always been captivated by him. His highs were high like creating the EPA, negotiating SALT and pulling out of Vietnam but his lows were very low most notably being the Watergate Scandal which has overshadowed his presidency. I've also just found him as a person just very interesting from his harsh upbringing to his battle with mental health.
One of my favorite pieces of presidential trivia even though it's a bit morbid! Happy 4th to you and the whole community!