I bought the Stampin Up black Big Shot because only the Big Kick is available where I live. I wanted the taller top handle for grip, I didn't want the deep white feed path of the Big Kick because I felt it would look dirty faster and catch bits of glitter etc, and honestly, I thought the SU Big Shot was a lot prettier and when I ordered a couple of dies I got free stuff that made up for not being able to use a coupon like I could have with the Big Kick.
It is my first machine but I researched thoroughly before buying, have used it a lot, and love it. It is so easy to use. I use Sizzix, Bigz, Cuttlebug, and Nesties in it with no problem. A friend tonight told me she is buying one too, just because she likes mine so much!
I think you will like either machine, though, and mostly the cosmetic difference was what sold me.