Oh, sorry. That termie looked like a lord, with that head.
I frankly finds all the marks quite useful in various ways; for example, the mark of tzeentch can be interesting mainly on terminators since it gives them a 4+ invo. I personally use the MoK most often, though, since I like to be pretty agressive with my units and I also finds the Icon of Wrath really useful. I also like to paint red.