Honestly, it depends on the task, really.
I'm comfortable in a few languages / frameworks, and each has their merits. If I'm building something with a dataset that I think Django's ORM will work well for me, and having its admin will be a benefit, then Django it is.
If not, almost certainly I'd drop into Tornado + Jinja, and an appropriate backend store.
For some other tasks, PHP might be the right answer.
I'm doing a lot with Django right now, so I'm probably more fluent in it than anything else, but Tornado is really sexy. Kind of a toss up for me.