DD rules can be different. Every single one I have played is an H17. After that, some have been doubling on 9-11, others, 10 and 11 only, some allow doubling after split and others do not, some you cannot re-spli Aces and some you cannot re-split any two cards.
The main thing is that you have to be vary of the number of players, the penetration and the rules. I would never play a full table. If the rules are decent and the penetration is about 70+ cards, I will play with no more than 3 others, prefer to play with just 2 other players. If the penetration is only about 60-65 cards, and the rules are bad, I will play with no more than 1 other player.