I prefer the second season. Sure, the animation is not as good, but I like the story a lot more. Except for the Sea Monster Arc I found season 1 to be kind of meh.
Personally, I found the higher difficulties to be very poorly balanced. The brutes are just bullet sponges that rush you, snipers that kill you in one shot, and annoying flying enemies that move faster than you can aim. As someone who really liked replaying the first game on Legendary, that really took the joy out of the campaign for me.
AlmostSwedish's comments