Sizing the New Kitchen Hood

This is the beautiful new stainless steel hood from Zephyr that we want for the kitchen. It comes in two different widths 30" and 36". The range is going to be 30" wide, but in reading up on exhaust hoods, some advise to get a wider hood since grease & steam don't travel straight up. I had a few concerned about the wider width. First, I was planning a stainless backsplash panel behind the stove, so it would either be wider than the stove or narrower than the hood which would leave questions for the backsplash above the cabinets abutting the range. Also with the pass thru adjacent to it I thought the 36" might be too overpowering. 
Our contractor suggested we make a cardboard template & see what we liked. I prefer the smaller 30", my husband likes the 36" size, he's willing to defer to me, though he seems a bit bummed. They both have the same 600CFM rating so they will both do the job.
As you can see in the photos, the kitchen is a mess as we've already begun tearing down old wood paneling, ripping up one layer of vinyl floor, and trying to find places for our food & such so we can still cook a little before we're without a kichen completely, hope that won't be too rough on Bob, cooking is his 2nd favorite thing to do.

36" hood

30" hood