Another quick question since I keep getting mixed answers... at what point is prioritizing crit/DH better than going for Det?

I've been told that while it varies on party composition, a rule of thumb is to meld for crit when you can get at least 2,000 and have a BRD in the party or 2,500 if you do not, while others tell me that Crit is king even without a BRD regardless of total and others tell me not to bother with crit at all unless I'm in a party with at least a BRD, preferably a BRD and a DRG/SCH.

I'm working on gearing up my RDM/SMN and DRG. At what point is it better to just stack on crit/DH as much as possible on those jobs for general use? (as in BRD isn't always guaranteed)