HD vs. Standard downloads from iTunes

I'm sure I've seen this before but can't find the thread -- does it really make that much difference downloading a regular def versus a high def movie from iTunes in terms of viewing crispness on an iPad 1?

Thanks in advance.

 

hd will look better, as the ipad 1 is still pretty high res and the standard res is lower then the specs of the ipad1
i would therefore download the hd version
get hte trailers and see the difference for yourself