M.A.
I used both methods when I was pregnant. I absolutely vote for taking the pill! :)
The suppository was messy & difficult - not to mention that we had to have mine made specially at a pharmacy that would do that (NOT close by! and NOT cheap!) because I needed a different dose (I think - it's been 5 years). And they had to be kept in the fridge... yuck! :D
I was way more comfortable with the pill - it was just less work. :)