fifedawg, I am on the fence with this exact decision as well.
I think what my ultimate decision comes down to is waiting to see what the Liine guys do with the impending Live Control 2.0 release. From what I saw in their promotional video, I believe they will have a step sequencer that mimics what is available on Push. The other aspects of push don't really appeal to me (at this point). I'd rather scroll through the presets and play them on my actual keyboard controller instead of the Isometric layout. Also, with the style of music that I write, I will be tweaking whatever I do anyway and things like changing velocity settings via push seemed very tedious. I feel like I'd be editing the loop soon anyway. Being able to step sequence ideas in quickly, however, keeps the creative flow rolling. The big thing, as lo.key pointed out, is the Velocity Sensitive keys. That would be nice for drum programming.
So, since I already have an Ipad, I think I'll wait for LiveControl 2.0 to see how much thunder it steals from Push. If its good for my needs, then I'll pick up a LaunchPad S as the triggering device. If not, it might be where Push comes to shove
