90% will only be viewed on a tablet, so may as well take them on a tablet….
Or take them on a Half decent camera that’s probably already in your pocket (iPhone 4s / iPhone 5) and they will appear on the iPad anyway via iCloud.
Or take them on a good camera, and import them very easily as mentioned above.
The camera on the iPad is really quite poor, and add to that the fact that its not that easy to carry around all day, or to take pictures with, I really can’t see why anyone would do it (other than opportunism every now and then)
I have an iPad and an iPhone 5 and the first option works perfectly for me.
I take work related pictures every day using that method.