[Neithan]

Now, it is generally assumed that on a normal day elves are more powerful than men.

Although Elves do seem to be born with some skills that other races don't have, most of their greatness follows naturally from being immortal. They live longer and so they have more time to learn and practice skills. So if a Man had enough natural skill to compensate for his lack of experience he could still defeat the Elf.

To an average elf (which I would classify even below Legolas who I think is above-average) then ya the Wraiths would beat them.

How do you define an "average Elf". There are different kinds of Elves all distinctly different, so there can not be an average that applies to all of them.

As to whether who would win out of Elves and Men, I'd say it's an individual thing.

I agree

As for the Ringwraiths they seldom fought anyone directly if they could help it (with the occasional exeption of the Witch King). They preferred to achieve their ends by stealth and deception, sometimes getting others to do their work for them (Bill Ferny). They would not directly attack the Inn at Bree even though few of its inhabitants were likely to stand and fight. They use their powers to strike fear into others and whenever possible they debilitate their enemies and strike when they are defenseless (Dark Breath, Morgul Blade). They are of the darkness and they use it against others, and they hate the light. Glorfindel who had seen the light of the trees, was as much a wielder of light as they were of darkness and so they feared him.