I don't think there's a definite "best" resource set. But a personal favorite of mine is the agricultural set: Construction, Beer, Fish, and Fast Food. It gives a lot of citizens and some decent infra cost reductions/+ happiness. More people and money, meaning more when you collect taxes. And then you got the infra cost reductions, meaning more money to spend on cheapened infrastructure. But that's just my opinion.
Some things, you just gotta personally find out for yourself.