A coachie just asked for advice about different condtioners so I am copying my response here for future reference:
Leather CPR is my favorite general purpose moisturizer/conditioner. It is inexpensive, readily available, does a good job and doesn't have any odor. I usually put a couple of applications on most of my rehabs.
Apple is similar but it has an odor (it fades with time) and it is difficult to find, but it works okay.
I use Lexol conditioner on textured, pebbled or delicate leather bags (not suede or patent) or when I am am doing a quick, maintainence procedure before putting a leather bag into storage. It also has an odor but it fades over time.
(Lexol leather cleaner is a good product to clean bags for maintainance or in cases when you don't want to give the bag a bag a bath. You can also use non-bleach Lysol wipes to wipe down a bag inside and out for cleaning. And I have heard that non-alcohol baby wipes are also good for cleaning.)
When leather bags are very dry I use leather therapy and/or refined 100% pure emu oil. Emu oil is odorless but leather therapy has a persistent odor - but it is not unpleasant and it can help hide the smell of a musty, older bag.
Blackrocks is heavy duty but it is a great finishing step on scuffed, faded, worn vintage bags. I use it to do one or two final treatments on a glove-tanned leather bag rehab.
I haven't used Obenauff's yet but I understand that it is great last step for waterproofing a leather bag.
I try to use all conditioners sparingly and to let the leather rest for 24 hours between applications.
This isn't a universal approach that will work for all bags, it is just what I usually use for my rehab projects. New rehabbers should post pics and ask for advice here before starting a rehab project.
Other suggestions/opinions/suggestions are welcome!