Necropolis or Castle (Which one is stronger?)

Yeah, what kind of idiot would play 1v1 on an XL map? Necropolis players are weak on S maps! (People play 1v1 on S maps)

1) Not only "idiots" play 1v1 on XL maps.
2) Why specifically 1v1? Maybe there are many opponents, but there's a Necropolis, which gathers hordes of skeletons.
3) On small maps, the undead have few skeletons, but building angels – the main force – is VERY difficult behind the castle. So, the forces are roughly equal.