You technically could put Reflections over the Zymol, but I wouldn't bother since they're both cleaner waxes and one would probably remove the other.
I would not recommend S100 or Zaino (or a lot of the popular products mentioned at Autopia) because they should be used with at least 1 preparation product beforehand. For someone who doesn't want a lot of fuss with keeping the car waxed and looking decent a good cleaner wax is probably the way to go.... unless you don't mind 1 extra step of course.