It would depend a little on when in December you are going. F! isn't presented nightly until closer to Christmas, so if you're going earlier in the month and wanted to see F!, then you'd need to include the Friday in your plan. Otherwise, I'd also probably aim for Tue-Thu because the crowds might be a smidgen lower, but it's also possible that given the AP blockouts that start to go into effect in mid-December, there might not be much difference between the two choices in dates.