Evga has the best customer support, bar none. So if something does go wrong, they'll do more to help than anyone. However, the chances of needing that with those 2 psus is astronomically slim. Both are GradeAA psus, not only for output and performance, but quality of platform, components, workmanship. Seasonic is also the only oem/brand I've heard of that gets companies like newegg to ship a unit for professional review, not some could be cherry picked specimen from the factory. Pros get to literally review a unit you could have bought off a shelf. That's testament to cirtainty of quality by the manufacturer.
Seasonic is generally considered the bar to beat in psus, many try, most fail.
In this case the Evga is a better psu than the Focus, more inline with the Focus Plus.