Yeah it's all about your schedule and willingness to deal with inconvenience (of temping mostly). If you're trying to be very conservative or, alternately, looking for ways to cut down on abstinence time, I'd argue for STM. Creighton is more straightforward imo, because it only checks one thing. But, of course, if you have a lot of inconsistencies with CM, it might be better to have another cross-checking sign or two. It's all up to your preference on that.
In our case, we have to use an "all of the above" Marquette style method because of little kids waking up at night and the need to be very conservative. So we use STM plus an ovulation test kit to confirm ovulation. :shrug: Not ideal since it makes that "window" CAmeliaD talked about pretty long, but we can't afford more than two little ones right now either financially or health wise! Not worth risking my wife's health, though I have to concede that it's not particularly fun. But hey, that's part of the sacrifices you have to make sometimes in life, and God did keep my wife and little ones safe through some rough patches, so it's OK with me.