It may just be my personal prejudice based on my friend-group, but my impression is that there are a lot more people on PC willing to seek out, try, and talk about unusual/obscure games. More people on mobile tend to get their game recommendations from the "Top Paid" and "Top Free" lists, and if you're not Angry Birds or Minecraft Pocket you're not likely to have a lot of people notice you.
Not that PC gaming doesn't include a huge contingent of people mainly play the big releases (CoD etc), but even among my esports buddies who play DotA all the time there's still a lot of excitement about smaller studios.
EDIT: Speaking of, anybody want a copy of Brothers: A Tale of Two Sons? I picked up a couple of extras during the last Steam sale to give away since it's not nearly as well known as it ought to be. Difficult to describe by genre, but I might call it an interactive fairytale? Requires a controller (each thumb stick controls a character).