Here's the deal with Degussas Creapure. Back when it first came out a bunch of suppliers were using low grade material from China. Here in the US and UK the FDA and our Trading Standards tested them and they had a LOT of impurities. The idea behind Creapure wasn't just producing a creatine but one which was, they promised, 99.99% pure.
Now that sounds great except the quality of the low grade material started to improve. Toxins and impurities got a lot lower. Now even cheap material tends to be 99.9% pure.
All that means that if you were able to gain a 1000g on creatine. Then the difference between the two is 9g. Or to put it another way 00.09%. Given the additional cost of Creapure vs any other form it's probably easier to just add a tiny bit extra.