Chaps are heavier, more protective than breeches, also more uncomfortable, IMO, lol. Breeches are quite a lot more comfy, they don't bunch up or rub like jeans. If I went back to showing western, I'd keep my breeches and put chaps on over them. The trick is getting used to them at first, especially if your saddle has a smooth seat. You will slide, especially if your position needs work. For rodeo, I'd do breeches with chaps over them. If you're brave, or the western riders in your area are forgiving, you can go with just breeches and cowboy boots. Functional, but wierd looks abound.