I prefer to know the exact amount of tokens I will be receiving for the specific task, not stakes. The best bounties are from already existing projects that are already on exchanges and you actually know those tokens won't be worthless when you receive them. And of course those that pay in ETH, they are rare, but they do exist. I also like to do as many different tasks as possible, because sometimes the rewards aren't counted well and they are greatly reduced, for example in Twitter campaing. So I like to do at least Twitter + Facebook + Article + Reddit to make sure I will stack some decent amount of tokens.