The flavor and purpose of the stronghold can't be duplicated by other boxes, but I want to discuss the functionality of this stronghold.
The cost reduction trait makes it almost identical to playing Ronin out of any Clan but Lion, and Unicorn can still buy their Ronin easier if HR isn't an issue.
So that leaves the box ability. +2F to an opposed Ronin. I like Shiro Daidoji more, but I'm biased.
Does this box offer any significant advantage to a Ronin Military deck over using another Clan's box?
In the midgame, -1 gold cost per Personality and Follower probably saves you 3 or 4 gold per turn; in terms of raw economics (ie looking just at gold production and gold costs), that is probably superior to having a 4 gold Stronghold.
You still need to factor in that Border Village is not boxable for a Ronin deck though, but even without Border Villages, in midgame, I think Breaking Dawn has a slight midgame economic edge for Ronin over other Strongholds.
In the early game though, no, I don't think Breaking Dawn is stronger than the other boxes.
Then again, if you want to play a
Ronin Deck, I think this box speaks to that deckstyle better than any clan-aligned Stronghold.
