i use a piping bag. i made some strawberries yesterday with a drizzle affect. filled my pastry bag with melted chocolate made a very tiny snip atthe end and drizzled away!
When I did my strawberries, I found that the line I got even when snipping a pastry bag as small as possible, wasn't as fine as I wanted. And using a #1 tip didn't work. So I made a parchment cornet following the steps in this youtube video and it worked great!
I use a squeeze bottle filled with melted chocolate. Then I can set it down if I need to and not have chocolate gush out of a piping bag