Observables are pretty great when you have to coordinate a lot of async actions. The main downside is that they have their own learning curve - an article descr

Observables are pretty great when you have to coordinate a lot of async actions. The main downside is that they have their own learning curve - an article describing a Model for Reasoning about Observables would likely be much longer than the OP - so if you only have one or two async actions to deal with at a time, Promises will probably be simpler to implement and maintain