I'm... not sure! JJ1 is more challenging but JJ2, even with all the Dummied Out stuff, feels more polished and refined. I guess many people in this topic got it right, JJ1 has a much better singleplayer experience, the way you take it out of the box, install and play right away, but JJ2 laid out a much better foundation for pushing it to the limit with user content. What you could assume is, JJ1 is definitely the better option when you don't have an Internet connection, but in 2014, you'd have to admit that's a moot point.

and in the end, there's no doubt that JJ2+ is the superior choice over both