It always varies for me. "Divine Wings" was my very first SX cd, so it holds a special place in my heart. That, and the title track is probably the most phenomenal epic ever written. Yet "V" is just beautifully melodic, and heavy, and that combination is always a winner. "The Odyssey" is the band rocking at its finest, with just as good an epic track as "Divine Wings."
But right now, "Divine Wings of Tragedy" is my favorite. It could change, though.