The best shapes for clams
Clams opened in white wine with garlic and parsley, their liquor becoming the sauce as they release it. Served in bianco without tomato in the Neapolitan standard. The liquid is thin and briny and there is very little of it, so nothing should be allowed to absorb it.
Clam liquor, wine, oil, and garlic. The thin briny emulsion coats flat strands, linguine's oval section holds more of it than round spaghetti.
Canonical: linguine, vermicelli, spaghetti. Duplicate-checked against mussels-and-clams: vongole is the strand dish, mussels-and-clams covers cupped-shape shellfish stews.

A linguine strand is an oval, not a circle, so it lays two flat faces against a sauce instead of one curved line.

This is a short, thick, rough fresh ribbon, so it wants a sauce with body and pieces to catch.

Spaghettini runs thinner than spaghetti, so it boils faster and asks for sauces that stay light.

Which sauce fits depends on which vermicelli is in the box.
What we would not put it on
Ridged short shapes. The clam liquor is too thin for a ridge to hold, and the shells crowd a short shape out of the bowl.
Want it the other way around? Start from a shape in the Pairing Finder.
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