Cayene pepper actually is a very cruel option. If it gets in their eyes it will hurt them badly and they could scratch their own eyes out tryig to get relief. If you research it a bit, you will see that although some suggest it, it can be a very deadly alternative and is not recommended for any animals. Remember, some cats are pets and they may be someone’s best friend - harming them would be cruel.
Mothballs are also very toxic and when it rains their odor will be very strong and that is all that you will smell. It's not good to have in the soil when they break down.
The chicken wire is a good alternative. Cats don't like to step on rough substances and their paws can be sensitive. Also after trimming evergreen bushes, roses or some other thorny type plant use the trimmings inside your pots on top of the soil. This will make it unpleasant for them to stand on. Stones and large pieces of rough mulch could also be used.
As mentioned citrus will also work since cats hate the smell. Sprinkle good-sized pieces of rind over the cats' favorite spots. Keep replenishing them as they will breakdown and add nutrients to the soil.
There are other herbal alternatives that are nontoxic and there are also commercial products available that will deter them from using your pots. There are also some plants that will deter them - perhaps your local nursery could give you more info on these.