For non-shooting, storing and fondling/handling, the best option is to use a microcrystalline museum wax called Renaissance Wax. It can be applied to leather, wood, metal and will form a non-invasive invisible barrier against moisture and sweat.
The best treatment for leather is still nothing at all. Just wipe clean and leave it. Do not store the guns in the holsters.
If you want to shoot them, just a light coat of your favorite gun oil will suffice. Frame rails especially, but don't overdo it.
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