Mike,
We (Harris) have purchased videos from both. There are variations in product quality on both sides. For instance, Keystone's VB 5 was very good but their Visual J++ was awful. AppDev's SQL Server 7 was excellent and their Visual Interdev 6 was marginally acceptable. AppDev seems to have an edge in the technical quality of video production. HTH
Bob Tracy
Never engage in a battle of wits if you're only half armed.