Who should I drop for Week 10 in place of the Kicker? Ty Johnson or JD Mikissic?

I'm not tryna be a dick I promise, but if this is a flex question you're pretty screwed, barring a very deep league. If it's a stash question, absolutely look almost anywhere for a flier. Push comes to shove, I think Johnson is more likely to get you any production. 

Actually they are both worthless.  Very few teams with either of these players on their roster will make the playoffs.

I'd drop Johnson if you're not willing to drop your current kicker.