The first “Noble Truth” of Buddhism is that all life is suffering; anyone with an Associates Degree in Armchair Philosophy knows this. But (s)he also has enough grounding in Internet kitschy truisms to know that “pain is inevitable, but suffering is optional.” And if you haven’t been living under a rock for the last 27 years, you’ve been told by the Dread Pirate Roberts that life is pain (your highness) and that anyone who says differently is selling something.
There’s no scientific or empirical way to evaluate any of these statements. They are non-falsifiable claims. In service of a high quality of life, is it useful to hold one or the other? Or somehow more than one? Is it even worth asking?