Flexileaf and Relief Factor have different ingredients. Looks like both products are addressing more of inflammation and pain sensation, but not the cartilage support as they do not have glucosamine, chondroitin, or MSM.

Per website Flexileaf content: Magnesium Glycinate, Alpha Lipoic Acid, Butcher's broom, L-Carnitine, Turmeric and CoQ10. https://getflexileaf.com/

Relief Factor: Contains fish oil, Epimedium, Turmeric and Japanese Fleeceflower. https://jointscenter.org/products-comparison/
Review for Relief Factor pointed that its cons are: Does not include CMO (Cetyl Myristoleate), Boswellia Serrata Extract, or Holy Basil.

Please post your experience with Flexileaf. I have not taken any of these supplements yet, but I am looking for a good supplement for joint stiffness.