I know, this is about iPad apps comparation. But if someone compare two non-effective methods, it’s good, if someone writes, there is different one method, which is effective.
I tried lots of virtual DAW on iPad. V-Control is good for me, because it is very close to HW controllers, and there is screen sharing. This could solve the problem with eye switching. But Pad is very small for working on it. Lemur is good, as universal, and customisible controller. But it is not nice controller for me.
I tried to use touch screen LCD too. But I found, shortcuts, and trackball is much more faster and ergonomic.
This is my point: there is no great iPad app for this. There are better HW devices, than iPad is, for this type of work.