Pretty Lights is fucking sick, but he is not anywhere close to Deadmau5's level of production. Deadmau5 could very well be the best EDM producer in the world, nobody does the shit he does. And I don't even mean musically, his processes and the way he goes about making his music is absolutely insane. Its completely organic, whereas PL is just recycling other people's chords, vocals, notes etc.
Thats like... Putting T-Heed in the FWT and comparing his run to Candide's. Its just not the same.
That said, I can enjoy listening to PL as much as Deadmau5 at any time of day.