Depends what you want. I bought a Top Card (which is still waiting in my repair queue) because of the three independently firing bumpers (unusual for a Gottlieb) and FOUR slingshots. I have a thing for random and fast games and, with no drop targets, there's almost no slowdown on TC.
Sky Jump's going to be a slower game where you'll be picking off the drops. Up and back, up and back. Still a really fun game and will sell for more because of drops. I'd say it's a bit "easier" than TC because some of TC's stand ups don't really have a line of sight from the flippers.
Both have great art for their themes.
You can't lose with either one.