Both options present their benefits and challenges. As a Private Label seller, you benefit from having your own listing and don't have to worry about the fierce Buy Box competition that Amazon is known for. The downside is that no one knows your product yet. When selling Wholesale, you won't have to put a lot of effort into marketing, since your products are already well-known. You will have to compete with other sellers for the Buy Box though which is a huge challenge in itself.