Yup the good ones are made with windpro (my KK is and I'm pretty sure Snoozys have it in their wet zone too)

As for front snapping and side snapping - go with what day nappy suits your kids best. If they suit front snapping - get those. I wouldn't spend a LOT of money on a side snapping one (ie a night nappy) if you didn't have any and weren't sure that it suited your bub.

I luuuurve side snapping nappies - but don't have any in my night nappies unfortunately - most of mine are velcro