It's amazing how much crossover we are getting between the two games. I think the one you learn first is your first love, but then the other one is great too.
Biggest differences:
1. Most Chronopia models have two actions, and Warzone models three.
2. You can Run in Chronopia at 1.5 speed but not in Warzone.
3. One's and Twenty's. The most fun difference. A 1 is an auto wound and a 20 is a fumble, losing remaining actions in Chronopia. In Warzone a 1 adds to the damage, and a 20 deducts from the next shot.
Some people want the generic version of the engine to clarify this once and for all and make everything the same. I love them just the way they are.
You'll have a blast in Chronopia. Let us know what you are looking for, modelwise.
Cheers.