Strategy: Universal Binary or Separate Apps

Is there a huge advantage to having your app listed as a universal binary in the app store?

When I make my iPad game iPhone size, it works OK, but the buttons are pretty tiny. I think it would be somewhat easier to play if I tweaked the layout to make the buttons bigger on the iPhone version, but I'm wondering if I'll be causing problems I'm not aware of by splitting my game into two listings--one for the iPhone and one for the iPad.

What do you think?
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