If you had an overwatch ability irl, which one would you want?

The rules are that all ability cooldowns are in hours instead of seconds and you have to have an ability which has a cooldown. Also it is natural that with any ability that uses equipment you have that equipment (e.g. ana's biotic grenade).

My friend and I have discussed this and he thinks moira's fade (6h cooldown) would be the best and meanwhile i prefer tracer's blinks bc they can stack.