Which one do you think is a quicker way to develop a simple app both for Android and iOS?

Yes, those are also some of the best options. I don't like React Native because of the Facebook's backing, they tend to change terms or licenses time to time. PWA is my favorite but most of the people are non-technical and they want to install something from Apple App Store or Android Play Store. I also like Xamarin Forms, but unfortunately I never used C#.

Kotlin multipleIndu Pillai

Thank you! Ibrahim Abdellatif

Indu Pillai X.F its easy for c# devs. Now with .net5 should be better i think