Taiban don't really have rankings. It's translated as battle of the bands, but in meaning it's really more like a small number of groups, usually two but sometimes more playing back to back, which is why I referenced the previous concert with S/mileage and SKE (which was absolutely competitive if you hear how people talked about it). The 対 part more or less references that with it being a shorter show with multiple acts means that each act will be performing for the fans of the other group(s) so it is up to the performers to win those fans over. That said, I'm unfamiliar with the program so it's not impossible that there are rankings, just that it's unlikely. Scoring groups from different companies is generally a no-no in Japan, but it could be fun if something does actually mix that up.
If memory serves (it's been quite a while, so I could be wrong) there were no specific rankings or overall winner declaration when BEYOOOOONDS did their show with @17, but I think I remember them dong some little games/"battles" between performance segments (I think one of the punishments was BEYOOOOONDS having to do super cutesy member introductions).
Wouldn't surprise me if some on the fan side of things put a little more emphasis(?) on this one though, given H!P/*48 history.