The first month I was here in our new CYV at the time, a neighbor found a rattlesnake in the garage. That was enough for me, plus roaches, lizards and flying insects, I'm surprised everyone who leaves their door up somewhat doesn't have a screen. I had one installed right away.
In a CYV we had only a 12' door, a 2 car garage would have a 16' door. The obvious choice is, are you in and out a lot. The screens that are motorized I find people washing their car or working in their shrubs, will put the screen up and leave it up while outside, which defeats the purpose.
We went with the horizontal slider like pictured below, and I would say in our villa community, out of 80 units about 25 have horizontal screens and maybe ten have the motorized. The reason it's better, especially on a 12' door is they are four 3' sections. So you only open one section to go in and out and the screen will stay shut the whole time you're outside. We had one installed in 2012 for $850, our neighbor got a motorized 12' screen from the Market of Marion installer for $1650, so you do save money with the slider, those prices are from 8 years ago.
Our laundry is in the garage and I like having the garage door up anyway, so I can go out anytime and not be in the dark. If you want even more air, I found cracking the the attic steps opening about six inches by just pulling it down and putting a small box or something in the gap to hold it open, creates a great breeze. However, this will defeat your garage wall fire protection, so you may want to remove it when you're not out there.
