Got the Hammer drill, NIB, for free, so I went with that.
I did learn, though, that outdoor coated screws apparently aren't the same as concrete screws. Of the 5 I put in last night, one snapped off at about 90% depth, one stripped at the head, and one wouldn't go all the way down despite proper hole depth. So either I need concrete screws or I didn't predrill quite wide enough a hole. I'm not good yet at judging what size hole to predrill in various materials. boykster is right about the adhesive, though... even with only two proper screws and a couple not quite right, that board isn't going anywhere.