Gotta go with MGK here as well. Eminem's wordplay is superior, sure, but he didn't explain why he came after him in the first place or respond to the accusations MGK made either.
The low point for me was the '4 albums' bit where Em's talking about MGK not getting his facts right. It's was clear on Rap Devil that MGK both 1) thought the last 4 Eminem albums were bad and 2) was just cleverly using Recovery's album title in a rhyme, not saying he liked the album. So it was stupid for Em to try to make that point.
Saying MGK is a mumble rapper was also just wrong. He's not and hasn't been, and showed that on Rap Devil even. Trying to lump him in with that crowd was a mistake.
All this said it would be awesome to see the two of them join forces and diss the current state of hip hop on a track together. Not sure how that would happen at this point but it'd be great.