Analog film photography and cameras

I've been asked to shoot some editorial for a new magazine this weekend, which is a first for me. The creative direction is right up my street, natural light and some interesting locations, and I get on really well with the model and team.

BUT, I'm panicking over what to shoot on. They want film, obviously, and their references are mostly 120 colour so I'm taking Porta 400 (flexibility for the if the light drops) There's probably not a vast budget for film and devving so I've got to weigh up getting the most number of shots possible, with highest quality and flexibility of portrait and landscape framing.

Soooo, my choices are:

• Bronica 6x6 - more shots, can crop if needed, bit awkward to think about reframing whilst shooting
  
• GW690 - less shots, better quality, composition 'in-camera', but can't see what I'm really shooting
  
• 35mm back-up; OM4 or MJUii for the lolz and keep it fun
  
  

What would you do?