Depends on which maps u want to farm, or what mode you play & how well geared you are, or what level.
For instance gale with debuff upgrade can be necessary for some maps like gy, or sg, to defend against stuns or bleed ect, or may be needed for hc mode. Clock (charged) with mastery can be useful there for defensive ability for the same reasons, and double so if used together with gale mastery foe max defense.

However on my endgame 76 who is well geared, I find clock to be less useful. It has a greater recharge time compared to, say, ice, and needs to be closer range. I can spam all 4 attacks quicker without the longer recharge.
It’s situational.