Accept visitor as universal reference (rvalue reference)?

Is it better to accept a visitor (visitor pattern) as universal reference such that the following is possible:

class Edge {
public:
    template<typename Visitor>
    void visit(Visitor && v){ // Universal reference (binds to temporaries and lvalues)
        v(this);
    }
    int a = 1;
}

Edge e;
e.visit( [](Edge * p){ p->a++; } );

or is the following signature better void visit(Visitor v) (call by value, because the lambda is anyway movable?) or only by reference void visit(Visitor & v) which does not allow temporary visitor objects.

Whats the best consistent way to go?