Karaoke dilemma--BB or BF?

[RoboNyanya]

Hey all! I posted this in my own LJ, but then I thought 'Why not make good of the AHS community and ask what they think?'

[dilemma]Now I have both the karaoke versions of 'Beautiful Fighters' and 'Blue Bird' and I have no idea which song I want to do at Otakon, an anime convention in August, in the karaoke booth. I will also be cosplaying as Ayumi from the 'alterna' PV, so it seems very fitting to sing an Ayu song as well.

In a perfect world, I'd do both, but the wait to get a spot is long and butt-enlarging as I'd be sitting down waiting to have my number called. It's something I do every year, so I don't wanna pass this event up. I personally like the fun, empowering atmosphere of 'Beautiful Fighters' more, but 'Blue Bird has more actual time where I can sing instead of pausing for instrumental sections.[/dilemma]

Any input would be appreciated!