I played both difficulty. From both, my characters survived ~50 days so far.
I feel interloper is doable, it depends on how you start your snowball. I usually start from Timberwolf or PV, then I search for hammer and hacksaw as soon as possible, then directly rush to Riken to make arrowhead, knife, and axe. Then pick a location then go survive-as-long-as-possible mode. Sometimes travel if I really need some critical items. On the other hand, I feel stalker is bit easy, very affluent with l