Hey.
Yes, they are very much not compatible, because they're basically the same mod.
They have the same functions, the only difference between them is that WickedWhims offers NSFW features, while WonderfulWhims is completely SFW.
If you feel comfortable using WickedWhims you have no need for WonderfulWhims, as it's basically a stripped down version of that mod.
If, however you find that you don't want to see your Sims doing NSFW stuff you download and use WonderfulWhims so that you can use the stuff like Menstrual Cycle, Birth Control etc. without having to bleach your eyes afterwards.