Jeppesen is much better.
You can get the sporty's first disc for free, and I think you'll have an easy decision after that, that it is not the one to get.
If you can handle watching King videos, go for it. Most just can't put up with those folks for long enough to get a good learning session in.
The Jeppesen interactive stuff is really good. Kinda fun even.
It follows along well with their printed book, and even includes a digital version of the book on the CD. Interactive learning sessions, with a quiz at the end of each. Take tests as you see fit. After a couple sample tests of above 80%, they will print out a completion certificate. You can either send that in to have someone sign it I believe, or do what I did with mine, and have your CFI sign it. Meets the 'reviewed your home study' requirement option in the FARs.
I'd bet if Jeppesen made a demo of their software, King and Sporty's would be pushed out of the business.