Make sure you use products that have been very well tested as these will actually do your leather good and will prolong its life.
Using creams and conditioners on modern leather is now very outdated...
The best quality leather is known as Full Grain. This is the top split of the leather (also known as the hair split) but where no buffing, sanding or correcting has taken place.
The Full Grain then...
Buffalo leather is very tough, almost 2X as much as cow, and is a nice color. That's why its so hard to kill buffalo. The native Americans used it to make vests etc.