There is no definite ultimate ab exercise yet to be found...this is why every second infomercial is for a piece of ab equipment. You will get a wide variety of advice from trainers, because they will tell you what works for them, but all the same it may not work for you.
Personally, I find that any mix of crunches and hanging leg raises seem to work fine for me.
Another point is that people forget that their abs are working every exercise you do, especially in the gym. One of the best ways to gain abdominal strength is to do heavy tricep pushdowns, while concentrating not only on your actual pushdown form, but also on keeping the tension in your abs. This applies to a lot of weight bearing exercises
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