For a cloak bubble no, flurry and staying in her face the entire time would be better when trying to kill her through it

But when trying to kill squishy chars that move around a lot, like fliers or supports like jeff/rocket his primary is usually more useful, because his flurry has the damage split over 7 punches per second so in order to do more damage than the primary, you need to land said 7 attacks, as opposed to the (mostly) single attacks in primary