Noble Critical Focus(Knight) vs. Noble Focus(Warrior)

Hi,

I just want to know the diffirence between Noble Critical Focus(Knight) and Noble Focus(Warrior) in AP system.

Based on their descriptions, does it mean that Noble Critical Focus affects P.Skill Critical rate directly while Noble Focus adds to P.Critical Rate in Char stats window where currently capped at 500 which I believe also affects P.Skill Critical rate?

I have also read somewhere that even you already reached 500 P.Critical rate, you will still continue to increase skill critical rate when you add more dex. So going beyond 500 P.Critical rate is not useless?

Both are pre-requisite to the same skill (P.Skill Critical damage) on their respective tree.

For Othell GH is it better to go for Noble Critical Focus(Knight) or Noble Focus(Warrior)?
Thanks in advance.

Noble Critical Focus:
Lvl 1 - Physical Skill Critical Rate +5%.
Lvl 2 - Physical Skill Critical Rate +10%.

Noble Focus:
Lvl 1 - P. Critical Rate +20.
Lvl 2 - P. Critical Rate +40.