Gateway is still in business? I haven't heard their name since the early 2000's.
Gateway was bought by Acer several years ago. I have fond memories of Gateway's "cow" boxes from back in the 90s I'd be shocked if they are anything but rebadged Acer computers now. I don't think I've ever seen one advertised recently except (maybe??) when flipping past a home shopping channel on TV.
Considering HP's quality/history, I'd go for Acer/Gateway any time of the day.