I recently got my first iPad, what I found when I set it up there was a way to just send over apps and info from my phone so very little had to be done.
So both units are almost a mirror copy or each other which makes them easy to use and go back and forth.
One app that I use on both that I find exceptional is PhotoPills, a photography app thats great for everything astro, especially when combining it with a star gazing app, its a paid app but worth the price.
Another is Panora|Split a great app for Instagram if you take landscape more than portrait, the app allows you to split an image into numerous images and when the follower looks at it, the image has a seamless split
@Munch I have ProCamera on there
So what am I missing in my iPad experience, can you tell me any apps that are a much better or unique experience on the iPad than on the iPhone?