I own L4D2 and added you as a friend
And I prefer L4D2, becouse:
-Melee
-More weapons
-More campaigns (wich are more different from the others)
-More Zombies
-More game modes
-Better Graphics
-Survivors with more presonality (more interesting survivors)
And there is not only daytime levels. Half of Hard Rain is night time. Almost the whole Swamp Fever is night time. Dark Carnival is night time, The Passing is night time. Only Dead Center and Parish are fully daytime, so your facts are not right. And parish has the best versus multiplayer map ever; the Bridge Finale. And there is now these weekly mutations and Realism Versus, that came with The Passing. And Midnight Riders rock.