Redux

• Large community, so lots of resources available online
• Conceptually simple, clean abstractions
• Matured dev tools
• functional programming oriented, which offers cool benefits like time travelling, trivial action testing and such
• Actions and state changes are very traceable
• Rigid paradigm to work in (which is generally speaking a good thing)

MobX

• Very efficient out of the box (applies side-ways-loading without needing selectors etc)
• Very suitable for a state tree that has lot of inter data relationships; the data doesn't need to be normalized to a tree
• More OO oriented; you can use classes, instance methods etc..; less new concepts to learn
• UI is always kept up to date
• no flux like action dispatching required (although you could still do that). On large apps this saves tremendous amounts of boilerplate
• actions are really straightforward; you don't have to return new data structures etc. You can just alter objects and the changes are picked up automatically
• Functional reactive programming oriented
• Simpler to work with async actions

MobX is more concise, simple, do many things automatically and very performant. In the same time Redux has become an "industry standard".

You should check out this AMA hashnode.com/ama/with-mobx-cinspo7i500vyxs53buh8e…