Advertising is not a good system for that. If there are multiple companies providing A (the usual situation), advertising will not help you choose well. If you

Advertising is not a good system for that. If there are multiple companies providing A (the usual situation), advertising will not help you choose well. If you think you need A but in fact A is quite harmful and you're best off avoiding it in favor of B, but there's no money in B, advertising will actively attempt to mislead you. There is no magical ethical kind of advertising based on informing the customer. All advertising is 100% biased towards the decision of purchasing the product. That's what makes it advertising.