Hi Sarah
I would always be concerned at hearing a company dissing another company in a public event. I have never used Wordtracker personally, but with a long track record as it has I wouldn't dismiss it. Also, in the latest search environment I think information giving you insight and context would probably be quite useful.
What examples did the company who hosted the event give that their tool was better?
The problem with any keyword research tool for search now, the data is not going to be as rich as it was. Also, with personalised search how do you measure what is 'normal'? Bing will give you search data yes, and most tools I think use that data. So if you keep in mind that the numbers are not the same as you will get with Google they will at least give you an idea of the higher volume keywords in proportion to those that are likely to be less. By using that data alongside other metrics and competitive analysis, you have a better chance than having none.
If there is a silver bullet tool out there I would be delighted to know about it.
I hope that helps,
Peter