I am no expert - but as no one has responded as of yet, I can offer my limited advice with a lvl 40 DK. IMO I switch between the sword and shield and my 2H. The 2H gives you an executable, but I don't think that is actually used much in pvp. But id does have 2 great attacks on the 2H for pvp: The charge and the uppercut that are very effective in pvp because they stun players and do decent damage. The Sword and Board does have the charge, but I use that on my more defensive skills bar. I see many DKs tanking 10 - 15 players by blocking & reflecting. The most effective ones, which I am not, (yet) are good at tanking but can then deliver a hard hit. You really need champion points to boost the damage you can do as a tank, assuming you will not be wearing light armor. There are light armor DKs that can out DPS sorcs, but if you want to be a tank, you will probably be outlasting your opponent, then hitting hard. Hopefully some other experienced DKs will come and shed more light on their skills.