Honeybeealex- As "Peace" said, many opinions. The discussion either goes toward health or $$. My opinion only, is if neeeded I feed 1:1 sugar. I leave stores on for winter feeding, but I don't make my living through honey production. The cost for a commercial to feed sugar would bankrupt them.
I keep bees for pure pleasure, and make enough to pay for my grandchildren's education. If you are just starting out, try both in different yards and keep copious notes, then you make the call. If I fed you cat food all winter, you would live, but not be the most healthy critter compared to most.
MP gave a good explanation of things to be aware of with HFCS. What I am not sure of, is long term health. For me, I am sort of a purist I guess. Old fashioned type of person. The jury is still out on long term effects of diet not natural to the bees.
I can only share from my experience and those close to me who are keepers. One such person suffers 50% loss every year but can afford to keep buying bees, which is great for the breeders. They rob 100% of honey and feed. I do not know if the losses are just because of the diet, but I am positive the diet attributes to the losses in some form.
Kind regards