I would not use a ProSelect past a maximum of 3000 miles, due to the difference in filter media between it and the Napa Gold. The way I understand it the Napa Gold is designed to give better performance over a longer OCI. I use ProSelects and they work great, but I always follow a very strict 3000 mile OCI. I think even Pete C. posted in an older post here that Wix really doesn't recommend a longer OCI for ProSelect filters either. Also if your filter does not mount vertically and your application really needs a silicon ADBV, a Napa Gold would be much better especially in a longer OCI. ProSelects have a nitrile ADBV.
There have been some posts here about the Napa Nascar filter and Spin Flow, personally I just don't buy into the theory. I don't need that kind of filter anyway. ProSelects and Napa house brand HM 10w30 work just fine for my truck. But I may just buy a few cases of Maxlife 10W30 this month due to the sale price on it at Napa for March, $3.55 per quart, which is just a few cents more than Napa brand HM.