I played in a low ranked, majority-undead kingdom last age, so my observations might not be accurate for good kingdoms, but I've found bad kingdoms neglect to translate Sage's science to better results, and think their impressive numbers will carry their province. With anything opswise, there is a significant random element... especially LL. I don't know why people are pretending that LL is suddenly this massive strategy that will always work.
Undead is resilient against chains more than orc because of their lowered offensive losses, town watch/animate dead, and having the land to build extra guardstations. LL is a minor factor, but it is something that Orcs are restricted from using - unless there is another fakeout from the devs as there was with cleric and undead not having nightstrike. Meh.
Dwarf/Sage vs. a kingdom of Undeads obviously has many things in favor of the Sages. Really depends on the quality of players on the Sages... contrary to the belief of some of the people here, Sage is not a personality for static players to pump science ad infinitum. Against a good kingdom you'll have to make the most of boosted science to be more dynamic, where other personalities are confined to areas they're particularly good at.
At the bottom, I'm going to prefer a Warrior over just about anything, just by virtue of the pentatap, and warrior having far more opportunities to multi-tap and ambush during and after the chain. Also note that Dwarf/Sage is going to be quite easy to ambush without anonymity, so ambushing goes both ways.