When I first started managing our office's IT infrastructure, I assumed buying a UPS was a no-brainer. Pick one, plug it in, done. Three years, two fried servers, and roughly $4,200 in avoidable costs later, I can tell you: it's way more nuanced than that.
This isn't a spec sheet comparison. This is the stuff I wish someone had told me before I learned the hard way. Here are the questions I had to answer by burning budget and time.