Quoted from Whysnow:pro definately beats out the LE on this one. It really is not even close. I guess if you like sloppily intergrated toys then go for the LE/prem. Aside from that, the pro is an uber fast shooter and great flow. I see no reason to mess with that at all.
If you're talking about the hyper loop or metal ramps and trails, I'd disagree based on the video. Looks pretty cool to me. Of course it's hard to judge relatively small differences in play based on video, will have to try it to know for sure.
If you're talking the glitchy Death Star obviously that needs correcting.
Clearly not huge differences in play so it's all aesthetics if you think it's worth the extra $$ to upgrade.