[atomicnature]

Whatever you pick for the backend, on the frontend, I'd recommend sticking mainly to pure web technologies. You can get a decent phone version through capacitor or other webview-based solutions. Many eCommerce and such sites do just fine with webview based apps. It is so much easier when you can have just a single code base with some responsive CSS mixed-in to manage, rather than 2-3 codebases, with constantly diverging feature set.