So, we all know Etrigan for being an amazing poet that can come up with complex rhymes on the spot. That means that, once he practices doing it to a beat, he could be a phenomenal rapper.
As for Eminem, not only has he been in the game for a long time, but he created Rap God, one of the fastest and most complex raps ever created and first did it as a free style right on the spot.
So my question is, if they went head to head, who would win? (in a rap battle, not a legit fight.)