Between Poker and Ducky, I'd say depends on if you need arrow key or not. also if you need dedicated insert, delete, home, end.......etc.
Ducky would feel closer to traditional layout and Poker would feel more different. Though based from past track record it sounds like Ducky has better reliability, however with the introduction of Poker II I wonder if KBC has upped their game.
But for Red and Brown, I think it's a good choice. Though I started with Brown first then tried Red. However I find I like both switches a lot so I think it's definitely a good choice to start out with those 2.