Apple Watch 6 and New Smartthings app

Does anybody know if Apple Watch 6 has a New Smartthings app? I’m wanting a watch and new phone. So either Samsung Watch 3 (cellular) and Samsung phone or Apple Watch 6 (cellular) and iPhone 12. My preference leans toward Apple. This would be my first watch. I have a Samsung phone S6 for many years, but never bought a watch.