The twin rating and experience is going to be a bonus. Don't find yourself in the position of being second in line for a job, or having to go out and convert to a twin, for the sake of a short term financial saving.
I did the Bond course and found it to be excellent. The support from the training team is first class and they put you in a great position to pass the the IRT. The sim gives you chance to learn the procedures thoroughly before venturing onto the aircraft and the 10 hours actual flying is enough to convert those skills into the air.
It worked for me but Bristows do also have a great reputation (and will be doing their IR training on twins in the near future). I'd go and see both and have a chat. Get a feel for the place and what would suit you. I would definitely go for the twin option but if that is available at either Bond or Bristow, go for the one you feel most comfortable with.