It really is an impossible argument... because it all depends on what you are fighting against.
The general rule is, if you can be faster than your enemy, you want to be barely faster than them. If you cannot be faster than your enemy, then you want to be as slow as possible.
But that changes fight to fight depending on your enemy. For instance, above.. the PS Raven lost to the SS Raven because the PS wasted some stats on speed. If it had been a PP, HH or PH the outcome would have been different. If you are slower than your enemy, you don´t want any S.
But conversely, while SS sounds great.. if you are fighting something very slow.. then really, that second S is wasted, you would be better off with PS, HS, or even PH, HH or PP as long as you are still faster than your enemy.
So PS or SS Raven? Both.. use the SS vs fast stuff, and the PS vs slow stuff.