Quote Originally Posted by Shurrikhan View Post
Just know that Crit takes a long time to ramp up to equality against SpS (without any DHit, it takes almost 4k stat for Crit to nominally outperform SpS, assuming you can make optimal use of the latter). (Heck, it takes almost 3.5k just to outperform Determination.) If you want to use Crit at all, it's best to ramp it and DHit as high as possible, which may not leave much room for SpS.

Given that I love speed, I'd probably just go Speed>DHit>Det>Crit until later tiers just allow for too much Crit not to swap entirely over to it.
The "crit is worse than other stats until X tier" is based on bad information from Stormblood that got parroted at ShB's release. It only takes 17 points of crit to increase crit rate/damage by 0.1% (expected DPS value is a bit more difficult to calculate because of crit's exponential nature) compared to 6 points of Dhit to increase Dhit rate by 0.1% (24 points to reach an expected 0.1% DPS increase). Additionally, Determination takes 26 points to increase damage by 0.1%, and SpS/SkS take 26 points to reduce the GCD by 0.01 seconds (0.4% DPS if all damage is from GCDs, relative value goes down as more damage is from oGCDs or from sources unaffected by your class's chosen speed stat i.e. RDM's Enchanted Weaponskills or NIN's Ninjutsu).

So for BLM the expected DPS value of SpS far outweighs any other stat, but for classes like RDM, NIN, or MCH, crit quickly overtakes any other option thanks to its exponential nature.