Best Counting Systems & Index numbers

[spyu]

I was wondering what the best counting system for a good double deck game would be? Up until now I've been playing shoes 4 & 6 decks simply using hi-lo and the index numbers for these are fairly well known. I was wondering if anyone had any knowledge of what they would be for some 2 and 3 level systems. For double deck I'm assuming DAS, S17, Resplit Aces.