Leather Master's is what I went with after many days of reading. I did a test on my leather wallet (coated) that has been treated with
Pinnacles leather conditioner. Little to no change in feel, tried Leather Masters VITAL and it has really loosened up the leather. The corners of the wallet were very stiff before application, now they are very pliable. Big difference between an oil based conditioner and a water based conditioner on coated leather.
On uncoated leather
Pinnacle's conditioner works great, I use it on my 10 yr old Timberland boots that look like I just pulled them out of the box.