to OP, do whatever you feel like doing, both tanking jobs are viable. It's really not a day and night situation until you reach A8S (and even then, if you and your team are very competent, you don't ever need int down to survive). You don't really need Delirium/Dragon Kick for int down in A7S if your team goes for full VIT right side for progression/clear. my 2cents.
TLDR: Do both PLD/DRK if you can, if not, doesn't really matter until you get into raiding more seriously.
