KO vs. Hi-Lo

If anyone can help me out...I have two questions:

1) Which system do you recommend for a beginner counter: KO or Hi-Lo? What are the advantages of one system over the other?

2) I was reading about the KO system, and I saw something about KO Rookie, which said to use 2 bets, a low bet and a high bet, with the high bet being used when you hit the key count. I was wondering what the more elaborate version of the KO bet spread is. I play in a six-deck game, which means my Initial Running Count is -20 and the Key Count is -4. At what counts do I increase my bets? Assume that I use a 1-5 spread for the time being.

...thanks