What model of Android phone would you start with for testing a Java app? Is there one phone of which you can say, “Well, it works fine on here. There’s a good chance it’ll work on 75% of other Android phones and tablets”? And how valid is QA testing on emulators that run on MacOS?

What model of Android phone would you start with for testing a Java app? Is there one phone of which you can say, “Well, it works fine on here. There’s a good chance it’ll work on 75% of other Android phones and tablets”? And how valid is QA testing on emulators that run on MacOS?