I voted for Satyricon. "The shadowthrone" and "Nemesis Divina" are both superb if you ask me. Both among the three best black metal records of all time! "Rebel extravaganza" is also good, but kind of dissapointing after those two records! "Intermezzo II" is okay. I haven't really heard "Megiddo", but I think I don't want to either! I can't remember that much of "Dark medeival times" as I had it on tape once and erased it a couple of years ago, as I didn't listen to metal at that period in time!
I also think Emperor is very good. I have four of their LP's and they're all pretty good. "IX..." and "In the..." are both great, but doesn't match the two Satyricon records I mentioned, so this is why I chose Satyricon! If Burzum had been on the list, I would have chosen that, although it isn't really a band.