I'd definitely go for transits. They come and go. When you're feeling ****, you look in your chart and lo and behold there is a transit to a natal planet that you did not realise was going on.
Progressions are really helpful, especially when a progressed planet changes a sign, move into the 29th degree or are aspected by one of the transiting outer planets. One gets comfortable with the energies of progressed planets because they move so slow. It's only when there is an emphasis or crisis going on in the progressed chart, that they are really useful to me personally. Someone I know recently had her ascendant progress into a new sign and it was such a huge change. It was interesting to observe...