Rather than chow down a crusty 2-day old hot dog at the turn, I find it better to eat an energy bar or two. Over the years, I've tried almost every energy bar sold at retail. I don't know much about the comparative nutritional content of these bars, but I do know what my taste buds tell me: most energy bars taste like chocolate covered chalk.
However, there are a few energy bars that taste great. I think the best tasting bars are made by Promax. In fact, I like them better than regular candy bars. My favorite flavors are the Double Fudge Brownie, Black Forest Cake and Chocolate Peanut Crunch. If you haven't tried them yet, try the Black Forest Cake. I guarantee that you'll like it. If not, send me the wrapper and I'll refund your money.
I also like Snickers Marathon bars. They taste good, but don't seem to be quite as filling.
That's about it. Other bars may give you more protein, vitamins, minerals, antioxidants, yada yada yada. But with golf, do you need all that? Nah. Just choose the bar that tastes great and more filling. Also, be sure to wash it down with a cold beer of your choice. Great for writing a golf blog too. Just the beer, that is.