I'm not familiar with the greens, but have looked into the libertarians. Present Libertarian Party is an unprincipled joke; for a start, the candidate in 2016 did not support freedom of association. Right now, the party looks like a shelter for ex-Democrats that aren't progressive enough for the current climate.
Libertarianism that Ron Paul was pushing in 2008 and 2012 Republican primaries was worth considering (and I personally would love if the guy won), but notice how he had to choose one of the two major parties to get noticed, just like Trump did in the last cycle and other non-mainstream candidates did before them.
Libertarianism that Ron Paul was pushing in 2008 and 2012 Republican primaries was worth considering (and I personally would love if the guy won), but notice how he had to choose one of the two major parties to get noticed, just like Trump did in the last cycle and other non-mainstream candidates did before them.