I remember before the purchase was made, I was really hoping the government would purchase the Swedish Saab Gripen. I think it was one of the finalists for consideration (that's what I remembered from a few news casts at the time, but not sure if it was an actual finalist, or just someone saying they thought it would be a good option.)
The main reason for me thinking we should have gone with the Saab, was that I trusted buying from Sweden more than the US. I can see the US putting some systems in place that could give them control or some way to negatively affect the F-35s. I remember someone saying that countries don't have friends, only interests, but I'd still trust Sweden more than the US to not betray us in some way.