As a former TS for a few different groups, here's the score as I see it.
@drumztv SSRTT should really have reached out and offered to collaborate to help speed things up. Or gave a notification of their intentions beforehand so that the incumbent group was not completely blindsided. Common courtesy among scanlation teams.( If you already did that, then you're covered.)
@BaganLee That said, if you're taking 2-4 months to put out a 19 page chapter, there's something wrong with your group and it's neither courteous nor feasible to lay claim to a manga. I'm well aware of the challenges of scan/life balance, but if your team is taking that long, you may need to consider shedding some projects or identifying where your bottleneck is.
I disagree with coldtavi though, definitely would not want a half assed translation just to see it out quicker. Fortunately in this case, the quality of both scans is comparable, including the translation. I personally like SSRTT's typesetting better, as it makes for an easier read, but Hyakuro's has better SFX (very well done) and better cleaning.
Thank you to both your teams for your hard work.