When to swap to Ark Passive on Brawl King Breaker?

How many Aegir pieces is needed on BK Breaker before swapping to Ark Passive? I couldn't find any information about this online but surely there must be someone that has done comparison in Trixion.

Let me know your opinion on this, thank you!

UPDATE: Tried in Trixion - NOT worth to swap at 1 piece since you lose around 20% crit.