I think both players have their pros and cons. I strongly disagree with the fact the game is slowed down when Diskin is on the pitch. He has much more pace than Buderus (I realise pace isn't really that necessary for a hooker but it helps). Diskin is an extremely clever player. How many times have we seen him pick the ball up nd run straight at an offside player for the penalty? On the other hand I think Buderus is much better in the defensive line, easily making more tackles than Diskin.
Long story short - Buderus is better on defence, Diskin better on attack. That's the reason I think Bluey has both in the squad. If things go wrong for us in the game he has this option. If we need to gain a bit of momentum stick Diskin on. If we need to slow it down then Buderus. This is purely my opinion. I don't expect many people to agree with it