I never rode the original, but I can't imagine it being that much better, if at all! Knoebel's Twister is an amazing ride, its greatest asset is also its worst enemy, in a sense that its located in the same park as the Phoenix. With that coaster having sucha cult-like following and amazing reputation, I can see how its hard for the Twister to stand out. If the Twister was in practically any other park, it would be their flagship attraction.
As many have said, the Twister is the perfect complement to the Phoenix... it has great laterals, its layout is long and demented, and it has airtime which surpasses that on coasters that are designed to provide nothing but air (provided you pick the right seat).
Really, an amazing ride...