Take into account that Zirenheit has roughly 50 ATK over max crafted weapons on both sides, so I think if Zirenheit isn't still better they're basically dead even.
But as a result, people will see Red/Blue JBs as better because they're 7*s so less pricey overall to grind them. So...I guess in terms of setting them up and actually acquiring them, yeah they might be better options.
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