There's a lot of overlap, as I understand it, but I'm pretty decidely a-mil at this point. Riddlebarger's book was my first real exposure to it, and it answer many questions, corrected many interpretations, etc. As I got into Vos and Kline, it was only solidified further.
Discussion
Yeah, Riddlebarger was my intro to amil as well. I usually find those who like Van Til to be more post. I am definitely more of an outlier at my church with most of them being post.
I like to remind those friends that Van Til dedicated some of his books to his favorite prof, Vos.
Van Til without Vos gets you Bahnsen. Van Til with Vos gets you (idk, maybe) Kline or VanDrunen.