This only applies to anime the recently started this season/year not ongoing ones from last season. Personally for me the best anime this season is "Kore wa Zombie desu ka ?" it's just funny how the the main character a zombie that does not look like a zombie be involve in an interesting turn of events like meeting a masou-shoujo absorbing her powers and becoming one himself (and is now labeled as a cross-dressing pervert), though it might not seem that original it's pretty hilarious and entertaining though at the time writing this I've only seen one episode.
Now I ask, what's the best anime of this season for you?