Hi!
Just my humble opinion... but whatever you do... avoid those boring monotonous lectures, and stay clear of dicates!
Depending on the subject, material available, audience, etc... one method may be better than other. Another thought, is that the use of one method doesn't preclude the use of others, they're a complement.
For me, Powerpoint or the overhead projector work very well, and just chalking little details and needed/requested explanations. Giving students a few sheets about the subject is practical too. Anyway... for the occasional and individual briefing, as someone else said, a few A4s in a table may be the best option. All this worked for me as student, is helping me through the FI course, and I will use it to actually teach students.
Then, although it seems obvious, don't overlook your pronunciation, entonation, "clasroom space management", enthusiasm/self confidence and eye contact. If you don't pay attention to these little things, even the best method (or combination) may become useless.
One thought that helps me regarding this issues, is the idea that you are selling knowledge, so you have to make sure by all means that the student is buying it. I.e. think in a mix of what you think that would be more "popular" and what the student may be more willing to "buy" (ask yourself too "would I buy this?").
Hope this helps!
Rgrds / Pablo