Information Security Magazine Readers Choice awards are out. For Identity and Access Management it went Microsoft, IBM and RSA. I think if you asked professionals who have worked with more than one IdM product, you would have a markedly different response. In many cases readers vote, not based on actual experience, but with a “go with what you know” heuristic, that is, they vote on names they recognize. These kinds of votes are useful if you have to make a choice within 1-2 days. It’s a safe bet. If you actually have time to decide and evaluate, it would be malpractice.
The most accurate answer could be had by having people wager on the best product as measured against a set of metrics. When people are asked to risk their own money, it becomes more than a trivial exercise.