@ay All the courses I have had paid for are external. F the stuff Dell has for free... some of it actually is solid but like, find a certificate course/program that relates to YOUR position. Those that you you can't afford without a job, most specifically..
3rd party companies. For me, Offensive Security and SANS. The SANS courses are fantastic but they all cost about 10k, something nobody in their right mind would pay for out of pocket... Therefore, Dell will pay for.
I'm 3 SANS courses and a few OS courses deep now. They are very highly sought after and absolutely worth pursuing...
I have NO clue what certs are available for sales, marketing, etc... though. Research them and then submit a training request! If the course/exam is under 1k then it's basically 100% approved. If more than that then, it goes through finance I believe.