Ionic 4 beta release

I write app and i have to finish writing an app in 5-6 month.
The question is whether it is better to write on 4 beta or 3?
What is the date of the release of full version 4?
I’ll be happy to respond

With that timeline, starting with Ionic 4 seems like a safe bet to start your new project. The GM release of Ionic 4 looks to be soon judging by the change log.

author, Mobile App Development with Ionic