Beyonder is a God-Like, reality warper being in the Marvel Universe. Beyonder isn't really good or bad, he typically does what he wants and shapes the world around him to fit it, normally making a Battle World for both heroes and villains to fight in. Eventually it was retconned that Beyonder is the youngest and weakest of his species but he is still a powerful force.
Earl was a great choice, he has this powerful voice but also its also soft which helps sell that he isn't really good or evil. Fantastic performance all around.
I also like Steven Weber as Hipster Beyonder, while he is more one note and even gets some really generic lines but I like that Beyonder was more playful and calm to show off he was in controlled but when he gets angry he does sound dangerous. Plus I like the effects on his voice.
Both actors, I thought, did a great job but I think I'll give a slight edge to Earl.