Thanks a bunch, Jhohhan! That's a tough question. The truest-to-character choice would be to undermine both, but in the interest of playing the full DLC, I'd say he would align with the Dawnguard, the vampire's posing a greater immediate threat (not to mention their undead counterparts in Warhammer, particularly hated in Lustria). The vampires would just err too close to Chaos.
Thanks a bunch, Jhohhan! That's a tough question. The truest-to-character choice would be to undermine both, but in the interest of playing the full DLC, I'd say he would align with the Dawnguard, the vampire's posing a greater immediate threat (not to mention their undead counterparts in Warhammer, particularly hated in Lustria). The vampires would just err too close to Chaos.