"MacBook Pro" and "iPad Pro" are the ones you buy if you need it for work, because the increased price will pay for itself with increased productivity. But buy the "Air" or basic versions if you are primarily using it for more basic tasks and media consumption.
Not sure the "Pro" distinction will hold up for iPhone, though. I guess it depends if Pro Photographers actually will give up their "Pro" cameras for an iPhone 11 Pro. And I can't think of any other profession where the iPhone Pro will "pay for itself" in productivity increases relative to other iPhones.