That's a tough question, since it depends which you are wanting, For CAS, most will let you know if they are WW compatible, as far as rigs, or defaults. I use a lot of CAS CC and I hardly ever have encountered a problem with WW. On the other hand, furniture is another story; many coffee tables and end tables will give you LE, not on their own, but when you place something on them, due to the fact, that those surfaces are sometimes used on animations. This happens due to the Geo States of the particular pieces of furniture. So, what I do I build with a Sim always present on the lot, so that I know exactly when it happens and I just junk that CC.