The verdict is still very much out on this. Crit scaling appears to have been reset to go along with the higher stat numbers. Det was directly buffed. Skill speed was buffed but it appears as though they kept the scaling and now are allowing it to effect auto attacks (finally!). And direct hit is totally new so I don't think many people have an idea of how that stat will effect overall damage output.

As a safe bet, you could just stack crit and direct hit. But I think skill speed *might* sneak in as being a good choice for samurais because their damage output is largely unaffected by cooldowns and is heavily reliant on GCD usage.

Only melee class I would say for sure that already knows which stat to stack would be monk. Since their damage output is substantially buffed by crit procs. So monks can almost certainly start stacking crit now.