I believe Whizlabs' SCWCD 1.4 simulator may be a bit more current that JWebPlus's. I went through the JWebPlus simulator's questions, was scoring in the 90's, got the Whizlabs simulator and on the first practice exam, scored 75. However, it might only be because I was answering questions I'd never seen before. Ideally, getting both of them is a good thing. JWebPlus's (aka Enthuware's) simulator kinda has a better user interface I think but I can also say with confidence that Whizlabs' simulator's questions take you a little further into the material and as I say, are a bit more up-to-date. They came out with a new version of 2 of the 3 'practice' exams on June 30. At the real exam, I was glad I'd gone through both simulators. If I had to pick 1 of the 2, I'd have to pick the Whizlabs over the Enthuware for SCWCD 1.4. Hope this helps-
Jeff Wachhorst
SCJP 1.4
SCWCD 1.4