Okay, let's talk about Vienna game vs. Ruy Lopez please.
I just made a quick check of my megabase 2014. I searched for games in which both players had at least 2500 elo. This is how often the following openings occured:
Ruy Lopez 14224 times
Italian 1871 times
Scotch 1572 times
Vienna 268 times
King's Gambit 201 times
So how do we interprete these statistics? FoS seems to think that grandmasters are dumb creatures of habit who more or less brainlessly reproduce what they learned, and teach the same to the next generation. It might also be a conspiracy of grandmasters trying to make the Ruy Lopez look good for some unknown reasons. Behind this may or may not be a plan to world domination.
Personally I'm leaning towards the interpretation that grandmasters know rather well which lines pose their opponents the most critical problems, and they tend to play those lines more often than not. In other words, if the Ruy Lopez is played more than 3 times as often than all the other five listed openings together, this is a very good indication for it being stronger, more dangerous, having more punch than the others, and not by a small degree.
I consider the Queen's Gambit the strongest lol