I think you will get pretty decent grip with either of those two sizes as long as you've got good treads. It's really when you start stepping up to plus sizes and go low profile performance tires that you will have a decline in grip in the snow. For example, I'm running 215/45/17's on my 04 lx coupe right now, but when the snow hits I'll put my stock steel wheels with 195/60/15's back on for better traction.
Not that this really pertains to your question, but here is a nice tool to use when looking into which tires to buy. Hopefully you will find it as helpful as I do.
http://www.rims-n-tires.com/rt_specs...&text1=&text2=