NPC Opponent- Unchained Rogue 3 / Antipaladin 2 / Shadowdancer 5 or Unch Rog 3 / Antipaladin 7?

[ParagonDireRaccoon]

I'm making a group of bad guy NPC adventurers for the players to fight. One of them will either be a (halfling) unchained rogue 3/antipaladin 2/shadowdancer 5 or an unchained rogue 3/antipaladin 7.

The setup is a one-shot I'll be running for my old gaming group on a trip to Seattle. It will be half-reverse dungeon, the players will run the monsters trying to stop a group of NPC adventurers for half the encounters and playing PCs for half the encounters. The rival group is taking a different route to the same BBEG. The antipaladin 7 route makes for a much stronger combatant but the shadow dancer route makes it possible for the halfling to sneak to the final room if the players kill most of the NPC group.

So I'm asking for advice on both builds. The shadowdancer route has a few fun options but the antipaladin would be much stronger in combat. Thoughts?

[Drogos]

Shadowdancer so you get a Shadow companion. Permanent flank buddy to trigger all the sneak attack dice and str damage will make the pcs wary of engaging it. Plus the paladin can heal it and it's likely that you'll also have a negative energy cleric in the party that can too.

[ParagonDireRaccoon]

Thanks Drogos!