static const Member Value vs. Member enum : Which Method is Better & Why?

If you want to associate some constant value with a class, here are two ways to accomplish the same goal:

class Foo
{
public:
    static const size_t Life = 42;
};

class Bar
{
public:
    enum {Life = 42};
};

Syntactically and semantically they appear to be identical from the client's point of view:

size_t fooLife = Foo::Life;
size_t barLife = Bar::Life;

Is there any reason other than just pure style concerns why one would be preferable to another?