I own the Brown/Rio combination as well (I'm a beginner). I found it useful to start with the Brown one and move on as he focuses a lot of attention on some stance/physics of what is going on.
The snake roll, which is a hell of a good cast and not beyond beginner skills if you just stick with it, is barely touched on in the Brown video though, and Simon Gawesworth's coaching on this is really exceptionally good in the Rio video. The other aspect covered particularly well here and little elsewhere is casting with your 'other' (ie. left hand at top if you are left handed), and common errors therein.
I'd buy both if at all possible and stick with the Rio one if its not, as it covers more ground (International Spey Casting).
My own video, 'How not to do various casts - the consequences' is looking for an agent.