Rapid because most people i know dobnotbwant to play, or do not have time to play classical, but rapid still gives enough time to think about your game rather than just moving quickly, and I think is more valuable insights when analyzing. Blitz may be better later when I am more advanced and can see the patterns more instinctively. I also love classical when there is time.
I have watched your you tube videos for a few years and liked your style and your sense of humor and the way you explain things. After being stuck at 1300 quick for years, I decided to do something about it.