Hypersmurf
Moderatarrrrh...
Either one will beat DR X/Epic against its specific focus, so that's not a consideration, at least 
-Hyp.

-Hyp.
Bastard sword +5 Defender
• Bane weapon against Lower Planar Creatures (Evil Outsiders)
• Radiates Protection from evil (as spell) upon the wielder when drawn
Bastard sword +3 Frost Brand, +6 vs. fire-using/dwelling creatures
• Icy burst weapon does 1d6 frost damage per normal hit and on a critical hit does 1d6 frost damage and 1d10 icy burst damage
• Protects wielder as if wearing a ring of fire resistance (major)
• As standard action can dispel magical fires such as a wall of fire on a dispel check {1d20+14} or quench non-magical fires by being brought in to contact with them
• Wielder gains +1 to AC, saves, and initiative when sword is wielded or carried
Rodrigo Istalindir said:Neither. I think sentient swords are one of the dumbest things in D&D.