For whatever it's worth, I have and use both. I have also used AE polish (in the tubes) and kiwi (in the cans), as well as AE cordovan cream.
For new calfskin shoes, I use AE cleaner / conditioner to moisturize the leather. I also use AE polish (in the tubes) for the first few polishing sessions. After that, I switch to Renovateur and Kiwi if I need them to shine.
For my shell cordovan, I use Renovateur almost exclusively, though I usually also hit them with kiwi wax about 1x per year. If I want to get some of the burgundy coloring back, I use AE cordovan cream, but as stated a few pages back, you need to be really careful with this, and apply only a very little bit at a time.
I bought 2 glass tubs of Renovateur over a year ago - I am less than 1/4 of the way through my first one. You just don't use much of it....
Thanks for the objective response. I appreciate you touching on how long the Renovateur is lasting for you. This video from Crockett and Jones shows the guy liberally applying the Saphir, and it almost looks like he could go through a jar in less than a dozen polishings, rubbing it all over the soles and everything. http://www.youtube.com/watch?v=hqVi6BOaL5U When I saw that, I was like, whoa... I'm not sure I'm ready to afford that!