What's the best thing to do on a Drush: Kill a villager or distract your oponent?

Well, the title is pretty much the question. I'm practicing my drushs and most of the time I go to kill a villager, but for that almost all the time my Militias die in the process (at least 2 of them for sure).

So... this is the question: whats the better thing to do? Go for a villager kill or stay in the enemies base until they die (even if you don't kill anything).