[kasperpeulen]

Pros:

* Flutter is faster. You really notice that for example the animations in flutter are much smoother than in RN

* Flutter has really fast development cycle with hot reload (< 1s)

* Writing UI only once for both iOS and Android

* Better documentation

* Better tooling support in editors (VSCode and Intellij)

Cons:

* The Flutter ecosystem is quite small, there are many lacking plugins

* The Dart ecosystem is way smaller than JS

* RN uses the native widgets, in Flutter they are mimicked and sometimes wrongly, for example the iOS datepicker

[devxpy]

To add to this -

* Developing plugins (to use native code functionality) is fairly easy. I recently created a PDF viewer plugin for Android without any prior knowledge of java, in 2 days.

* Dart has smaller ecosystem but dart is a real language with a batteries included std library. I don't think I need to state the superiority of dart as a language.

* Flutter's non native components make it easier for you to customize them

* Flutter doesn't have an obvious way to use native views in apps. You can launch native views but compositing native and flutter views is a bit weird right now.

* The ease of use in the development cycle is phenomenal. Nothing like I've ever seen in UI dev.

[realusername]

I would add on the Cons that Flutter is a bit more verbose than React-native since it does not have JSX. And also on the Pros that the community is much nicer on Flutter, RN is Facebook's own pet project and it's very visible when you run into issues.

[sbjs]

Since there's so much competition in this area, hopefully this means Apple and Google will start to make this style of development a native part of their APIs and IDEs.

[beckler]

My only complaint so far is some things are not documented very well.

I started leveraging the json_serializable lib and all my responses were returning null... it took me a few days of heavy debugging to figure out it was how I crafted my constructors and how the code generators worked with it.

[devxpy]

Thankfully, the community is really welcoming. Not like RN where issue are closed for no reason all the time..