It's mostly if you're really interested/want to build units with Steady Breath, none of them absolutely need it to be good, but it bumps them to their max potential for the most part. Having that many merges will make him slightly stronger and boost his arena score. Me personally I would stick with the +atk one, but that's just me.
Side note: take what I said with a grain of salt, it's coming from a guy whose killed 7 brave Ike's, so there might be some bias. ;)
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