Much Ado: In the reading of the play, the supposed infidelity is talked about between characters, but not shown. The movie shows it more. The movie is very well done though, but yes, it requires skipping a few scenes.
Shakespeare’s plays usually have something in them that require a little “navigating”. Even if it isn’t part of the main story, there are crass jokes, talk of extra-marital lovers, etc. The good thing is that much of this goes over the heads of younger ones because of the language.
You can find a paraphrase of both plays online and read through them and see which one best fits your family’s needs. Google “modern paraphrase” along with the title of your play and you will get several sites. (Don’t let your kids read these – just for your personal research)