How can there be a choice between the two! Without a product, what are you investing in and without a vision, why are you investing in it!
I mean which one is more important, not choosing one of them. They are one of 4 standards to review an ICO project - can not postpone any of them.
They are all important, a good ICO can be determined by possessing an experienced team, reliable platform, good vision and the product. Investors had been attracted to an ICO which product endorse will surely hit the market, that is why both are significant when choosing a good ICO to invest.