If you can't decide, then why not be both?
Scoop some vanilla ice cream on a parchment paper-lined tray. Allow the scoops to firm up in the freezer. As the ice cream freezes, melt some chocolate (milk or dark chocolate...it's all up to you) in a double boiler & allow to cool slightly.
Take out the ice cream from the freezer and pour the chocolate sauce on top using a ladle. Return to the freezer when the ice cream begins to melt or, if you work fast, when all the ice cream balls have been coated in chocolate. Freeze again to let both ice cream and chocolate to harden.