Thanks for this thread, it has reminded of how happy I am that we don't have to see that piece of crap for a long time.
Sibierski is a better all round player. He can actually trap at ball at the first attempt, not lose it like a morom, and when it comes to actually getting the ball into the back of the net... they consistency seems to be pretty much the same, but Sibbers can also bring other players in it. Oh yes and Sib understands the offside.
This is a no brainer.