Desert Fathers - Axum (I burn this to remind me of where I came from, my journey to orthodoxy).
My absolute prized and favorite is simply in honor of St. Herman, called Spruce Island but I'm not sure which monastery makes it. Maybe someone else here knows.
I have used pine resin as well and enjoy it.
From what my friend tells me that owns Desert Fathers Incense, frankenscense is controlled in majority by corrupt black marketers and hard to come by, very expensive and usually in short supply. Seeing as how I live in the USA, I would be proned to switch to indigenous ingredients if I could learn to prepare a sufficiently burning fragrance.