Ever want to throw two bosses into the ring simply because they've both annoyed you? This week's Two Bosses Enter deathmatch strikes me a little that way: Svala Sorrowgrave of Utgarde Pinnacle vs. The Prophet Tharon'ja of Drak'tharon Keep. As much as I constantly urge readers to keep real-game play experiences out of the debate, I have to confess to mentally categorizing both these bosses under the "ZOMG, not this fight again..." section in the Annoying Speed Bump category.
Yet here they are in the ring -- so "to battle!" The usual rules apply. Assume that these foes share similar levels, health pools and damage output. We'll have to assume Sorrowgrave has somehow managed to drag an altar into our little Thunderdome, and we'll allow her to summon her three Ritual Summoners to pin her opponent on the altar. For the Prophet's part, since there are no players for him to turn into skeletons (and since he would be unable to turn Sorrowgrave's assistants into skeletons if he were pinned on the altar), we'll allow him to turn Sorrowgrave herself into a skeleton (with appropriately scaled abilities).
Focus your debate on the three S's: Style, Story and Scale. Don't get caught up in game mechanics and what actual players might do in each encounter. Consider the flavor each villainous gladiator brings to bear, then cast your vote for who you think would come out on top.