Universal Build or Application [HD]

Would you create an application that runs on iPad/iPhone
or create application in HD just for iPad and one thats
for iphone and (x2 zoom) on iPad?

And if you go with universal build whats the best
way to implement this? I always went with
480 , 320, letterbox method but that looks
horrible on iPad so either release HD app
or change to a universal build !

views:1574 update:2011/10/19 14:58:09
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