Contract and age aside, I'd take Vasilevskiy, Hellebuyck, Shesterkin. To me those are your elite, top end guys who are work horses and perennial Vezina candidates.
The next tier which I think Swayman is in but all these guys are interchangeable to me (again, age and contract aside): Bobrovsky, Oettinger, Demko, Saros, Sorokin, Markstrom, Ullmark.
So in terms of just skill, I would take the top group over Swayman and the bottom group as a comparable alternative. Anyone else in the league I'd consider a downgrade.
Now that second group, there's guys in there probably in the top-5 annually for Vezina votes but Ullmark and Swayman are the only two I wouldn't currently consider work horses.