Since you asked, I'm just a single data point of course, but I started out my voting back in 1970 registering as Peace and Freedom, then switched to Libertarian, finally and for good to Democratic because my wife pointed out that a vote that's not for either of the two main parties is almost always a wasted vote. 

I resisted that idea for a few elections, but it holds up pretty well to scrutiny over the long term; and definitely this year, which strikes me as the most important presidential election of the last 50 years, at least. Make your vote count ... unless you're thinking of voting for Donald Trump, in which case, please vote for the Libertarian Party instead.