I have been maintaining a fork of Titanium (because Appcelerator did not want to merge any of my PRs) and writing tens of apps in Titanium for 7 years. It is indeed a really strong framework. However 3 years ago i decided to switch to Nativescript for multiple reasons: * performances in Nativescript were way better when you were talking about listview and such components. The proxy system of Titanium makes it pretty heavy and REALLY hard to maintain * developing plugins or maintaining Titanium is a thousand times harder. You have to write all in Objc/Java and it is really hard to do live dev/debugging for the native side. * (3 years ago at least) gradle support was really weak and it was really hard to integrate native libs

It is only after that i discover the fact that i could use Vue and now Svelte