Originally Posted by Schell Shock
Being a high level player means you use your skills in a situation which garuntees the other AD carry takes more damage than you. This is called "trading". Sivir is by far the best at trading if you know how to play her.
Well then now your argument is focused not about the laning phase, but about trading damage, which I can see, but picture this. If your claim were to be about farming during the laning phase, you go ahead and farm as vayne. Sivir farms as well and we're avoiding trading damage for now, but then one of you guys starts to become aggressive. Now fighting against sivir, you would know that in your situation, if you were to be the first to be aggressive, you would lose at trading damage for she can boomerang you at a close distance with a less percentage of a chance for you to dodge that. But, if sivir was to engage first in that situation, your role in that fight is to avoid as much damage as possible. Thus you use your tumble at the moment in which you can guess when she's going to throw her boomerang, or if you have fast reaction, do it right when she has the throwing animation. Either way, there are ways to avoid her boomerang if you play smartly. Obviously that is why her Sivir's Q is considered a 'skillshot.' I'm not arguing that Vayne > Sivir, I'm just saying that you can't really compare the two in a one sided situation that Sivir will most likely win during the laning phase (= farming phase). It all depends on the player. Sivir can produce the higher output of damage, but that is if you let her to do that much on you and back to what you've just said, it all depends on the "level" of the player. There are those who know how to play against her.