Apple and Android. If you can name one Android(Google) luxury phone I am willing to listen. OnePlus used to be the one to go to.

I named five companies that if you search for "$COMPANY_NAME flagship" you will quickly find relevant models.

Now if you are looking for luxury phones, that's a different thing. Something from Vertu would likely qualify. They are expensive and are made from high end materials, but the phones themselves aren't that special.