Actually, sorta "none of the above."
I was a student of Guy Carawan's (early HD revival player) when he taught at a college in Southern California for 6 months out of every year (the other 6 months he spent in Eastern Tennessee at The Highlander Center). I fell in love with the HD from listening and watching him play it in the folklore class I took from him in Fall 1973. Then I took his "Appalachian external studies" program the following semester. This allowed me to observe his playing a lot more as I followed him around Appalachia. I also met Malcolm Dalglish and Sam Rizzetta at that time through Guy, and recorded and observed their playing. I also met John McCutcheon at that time, but I'm not sure if he was even playing the HD yet. If he was, I didn't catch him doing it.
I did attend several workshops taught by Malcolm and Sam in the 1970's, took some workshops at the "Summer Solstice and Dulcimer Festival" in Los Angeles, and had a lesson with John McCutcheon about 2002. Other than that, I did a lot of listening to recordings, tried to duplicate what I was hearing, and adapted it to suit my tastes. Ultimately, I came up with a style that includes lots of "compound flams" (sorta a la Dalglish), arpeggios and double stops, to name a few characteristics--a kind of "chord melody" approach to the HD.
Anyway, that's a thumbnail sketch of how I learned and what I came up with as a playing style. Back when I was getting started, there weren't even any dulcimer festivals. You had to be pretty inventive, self-reliant, and in the right place at the right time to even discover that the HD existed.