Bostitch Low Profile Nail Guns

Bostitch released a low-profile nail gun (LPF33PT), which uses a 30 degree paper collated nail. It is now my understanding that in the next few months they are releasing another low-profile nail gun (LPF28WW) that uses a 28 degree wire collated nail. My questions are:

1) Do I need to give a lot thought between using a 28 degree or a 30 degree collated nail?
2) What are the upsides / downsides between using wire collated or paper collated nails?

Thanks!

-- Stan