[Shovah32]

Mictlan will have higher blood income to start but when your hunting in all your provinces it should be around the same(also counts auto-summon free thralls). The flying lets them raid(if you know they wont die) aswell as getting then where you need quickly(particularly useful when defending) and their stats are pretty nice. LA Ulm actually does have better access to vampires(though lower starting blood income unless you use your second tier mages for hunting) due to counts only costing 44 slaves rather than 77 for lords(they have slightly improved stats and +1D and blood, none of which really help any of the strategies i listed)