Personally, I would try the pill first, since like someone said if it doesn't work out you can just top taking it. I believe the side effects of the pill are similiar to the side effects of the shot, so in the trial and error process with pills you would atleast be getting used to the potential side effects of the shot.
The pill, for me, isn't hard to remember. Set an alarm on your phone or something. It's just inconvenient sometimes, because i take mine at lunch at school (with food, just in case i'd get nausea on an empty stomach), and they changed the schedule around so that I don't have lunch at the same time some days. Most days I take mine at exactly the same time every day, but it's just approximate. You can be an hour or two late or early.