I am really stuck now i have thought about getting the cen aqua jet but now i have seen the cen wave shark and i like that now does anyone have any ideas on the best performer or anything that might help me decide please.

I need to get an answer by wednesday please because i might order it then.

You need to use a little patience here. This is the second time that you've done this. Three hours isn't a lot of time for us here in the States as many have jobs and are working while you're posting. A lot of people don't have experience with CEN Racing/Genko Trading boats.
Now to answer your question.
It depends on what you want to do with it. The Aqua Jet is easier to upgrade later on than the Wave Shark. The Wave Shark is better for playing with a rougher water than the Aqua Jet although it will need more floatation foam.

Im sorry i didn't think about the time difference and i am a bit hypo bout getting a new r/c boat.