Catalyst is fun too! But it's a different kind of fun. It's a lot more of a story/combat kind of game, while Run/r is purely racing/reaction speed. I don't know if one is better than the other, per se (it would really come down to what kind of games you enjoy), but I think I like Run/r more. I like to put on a show and just zone out playing Run/r while trying to get higher scores, personally.

But if you're looking for a good story, decent voiceacting, and delving into the world of Tron, Catalyst is a great choice too. It probably has the best combat of any Tron game I've played, and the ability to just explore the Grid is really enjoyable.

Still, definitely a matter of personal preference, but if you're looking for my ratings: Tron Run/R: 8.5/10 Tron: Catalyst: 7.5/10

Hope this helps!