i dont really think there is any room for comparison.
they are both masterminds in their own way
Well I guess the key difference is that Mike writes good music.
I love just about everything he has done, especially Moontower
Opeth has a higher chance of getting in the top 100 than Nightingale does.
Mikael has one of the best voices, and the best growl I've ever heard, and is an amazing song writer. But Dan's the man responsible for Eaten, so Dan it is!