Leather care question?

The cover is most important. As for actually caring for the leather I like Leather Therapy. They make something they call Leather Therapy Wash, which you use first to clean the tack. Then they have the Conditioner, which you use after. The conditioner doesn't just condition the leather, it also protects againest water (good in case it starts raining while you're riding) and mildew. Leather CPR is another good cleaner but Leather Therapy is my favorite because the conditioner protects againest moisture basically. And it says to use it with the Wash, so I just end up using that.