Certainly the Facebook app on the iPhone is or has been an unmitigated disaster in terms of the amount of resources it uses. It's a big pig and you can easily remove it and use the website instead. Now I can't say that for all Android phones some of them come with the Facebook app installed and you may or may not be able to uninstall the Facebook app.
But in any case you can always use the web browser to browse to the Facebook website. Now if you want to make it easier, you'll want to create a bookmark for that website and on the iPhone and on the Android phone you can take that bookmark and place it on your home screen.
So all you have to do is tap on that icon and it takes you to the correct website. That's probably the easiest way to use the Facebook website, instead of using the Facebook app. You should be able to delete the app just like any other application and use the web site instead.