As Russel said they're so different musically that a comparison between them is virtually useless... I love them both for different reasons. TSM is probably something that is "easier" to get into (if such a thing could be said for an Arcturus release), while PC is a bit more difficult to "understand". Don't forget that there are different people behind these two albums. Musically TSM is a creation of Sverd, while in PC it's Garm that pulls the strings. For me TSM was the best album in 2002, because for me Arcturus are probably the best rock band at this moment. But I believe that Garm himself described best in an interview the differences between the two projects... He said that as an artist he was more proud for his work in Ulver, but at home he puts an Arcturus album in the stereo more easily. Anyway the conclusion is that if you like "electronica" (for lack of a better term) then get PC... You won't be disappointed.