Gothik, while sweeteners affect everyone differently, I have heard many times that a large number of people seem to become hungrier and "crave" sweets when eating things that taste very sweet, even when the thing that makes them sweet shouldn't raise blood sugar. Diet soda is often mentioned as a culprit in this. Therefore, it's to your benefit if you can avoid sweets. If, like me and others, you find that going without any sweets makes you feel so deprived that you tend to overeat, it's better to have some on-plan sweets. But if you can avoid them, it'll make sticking to plan even easier, so do it!
Personally, I find that malitol can really cause cravings for me. I use the Popsicle/Fudgesicle brand of NSA fudge bars and don't have cravings from them. Hope that helps!