While we did just recently update the guidelines on poll/survey questions, it still doesn't mean that all random sort of polls/surveys are allowed.
When it's clear that there is a specific purpose behind a question, as supported by additional details, then questions like ?What?s the best beach for surfing on Oahu?? which require opinion based answers that could be helpful to others are appropriate. However, we still do not allow poll questions like ?this vs. that,? true/false, yes/no type questions or those that elicit low quality answers like ?What?s your favorite?? or ?What should I name my puppy??. Other "What's the best..." questions, if one is only looking for one word answers, or random lists of name/items, are also not allowed.