Visited the source and took the chance to compare these, not sure I’ve seen them all in CA.
fromage blanc: not like the French stuff but delicious, sort of like a smooth, creamy cottage cheese
mascarpone: closer to the Italian stuff than any other American attempt I’ve tried, texture is spot on but the flavor’s missing something
quark: too sour, though maybe similar to too-sour German ones I don’t like
crème fraîche: too sour, too stiff, nothing like the French stuff, unappetizing