First, both courses are excellent. Both providers are of the highest integrity, and they are successful Amazon sellers in their own right. I am an affiliate partner of each, which means I may receive compensation from the provider if you buy one.
The fundamental differences:
Price: Jim Cockrum's Proven Wholesale Sourcing is $297 for lifetime access (or get it for free when you buy the $399 Proven Amazon Course.) The Wholesale Formula (when it was last offered in 2018) was $1997 for lifetime access.
Coaching: If you need any additional substantial help from Jim Cockrum's Proven Wholesale Sourcing, Jim's team will suggest you hire a coach. I have heard this runs $3500 and up to start. There is nothing wrong or unethical with them doing this, and their coaching is excellent. That $297 price simply does not allow them to provide personalized help to you for free - doing that would simply put them out of business. That said, the course itself is of incredible value.
On the other hand, The Wholesale Formula gives you 4 live Q&A webinars, $3000 worth of software discounts, full access to all future updates AND a private Facebook group, where any question/problem you have is answered by the course founders themselves. That's why the Wholesale Formula price is higher.
Also, when you pay that higher price for the Wholesale Formula, you get Free $3000 in useful bonuses from me (some of which I pay for for out of pocket). These are in addition to the bonuses direct from The Wholesale Formula (mentioned above). I'm doing this because many Wholesale Formula students tell me "Hey Jordan I still need help with ______ for my Amazon business". That specific help include: $100 worth of freelance help, a $1997 package from a major, trusted fulfillment center, and a $150 Amazon product list (a list of products on Amazon that are ideal for you to consider sourcing because they meet desirable critera.) Again, all free. More details on those bonuses are here.
Two more subtle differences:
In short: If you're just looking for solid wholesale sourcing and selling training and you don't feel you need all the extra bonuses, Proven Wholesale Sourcing is excellent. If you are seriously looking at making wholesale the cornerstone of your business and growing rapidly, and you want to utilize the bonuses to help you with your business and personal growth, I highly recommend The Wholesale Formula.
See my research page for The Wholesale Formula for more in-depth discussion.