It's not one or the other.
Any election with a significant difference between the candidates is worth voting in. Also, it's vital to pursue methods of improving the world outside of showing up to vote one day every couple of years.
Anyone who's trying to set up a dichotomy between those two ideas, in this election at least, is probably trying to trick you into not voting. That might sound harsh and suspicious, but I have a lot of trouble coming up with a reason why someone who cares about moving the world forward wouldn't care whether or not we get Trump in charge.