We are in MI and I have used both UV ("greenhouse") 6 mil plastic and the 6 mil plastic that we purchased at Lowe's. I used the builder's plastic for about 2 months then stored it in the barn. Then I re-used it on the ends of a 16' wide hoop (about 8' tall). I put it up last Dec. (double layer) and it finally shattered to pieces this past week when we had gusts of over 40 mph. The 6 mil greenhouse plastic on the top of the same hoop is now 12 years old. Light transmission isn't as good as our newer hoops because it gets dirty and, with 2 layers, stuff gets in between. But it's solid and warm. And the peppers, eggplant, tomatoes and winter greens do well.
Unless you're taking down the hoop from season to season, I think the extra $ for UV plastic is well worth it as it really takes a lot of time to stretch and properly secure plastic. But, if you're taking it down, go for the cheaper material.