(iOS/Android) Should I prefer shared codebases (j2objc, C#, C++) or full native AND confortable solutions (Kotlin and Swift)?(Logic code, not UI)?

[Aadam]

Hi all, I would like to ask you a very urgent question to you, (ios/android) should i prefer shared codebases (j2objc, c#, c++) or full native and confortable solutions (kotlin and swift)? (logic code, not ui) I thank you for informing me please about this.