Markel and Sandro, which of them is more effective as a Necromancer?

The developers of the fifth installment decided to create a powerful Necromancer named Markel, and they borrowed some details from Sandro. For example, in the third game, there was a mission to gather 2500 skeletons; in the fifth, the number was reduced to 1000. Also, in both games, there's an important storyline involving the resurrection of a former human king. Nevertheless, in the fifth game, there were no expansions where the true identity of Markel was revealed. He was already impressive – he killed the Lord of Mages, enslaved Isabel, resurrected the king as a Lich, and almost restored the Necropolis state. An entire expansion was released about Sandro, detailing how he was the cause of all the troubles. He outsmarted the heroes, collected artifacts, and ruled the Necropolis state (controlling Vilmar), and so on. In short, Markel was based on Sandro, but they are both good characters... I didn't vote.