1. Greenbelly Meal2Go. I eat one of these every lunch.
2. Heather's Choice Packaroons. These are my trail snacks.
3. Nature Valley Granola Bar. Old school, but I just love them - I have since I was a kid. I always have at least 1-2 every hunting/hiking trip.
4. Luna Bars.
The above four are my "answers to the question" but lately I've actually been eating bars a lot less. The thing is, nearly all of these are very dry. You end up needing to drink a lot of water, and water is heavy so in the long run you aren't saving as much weight. That doesn't mean they're bad, and lots of folks plan to get water where they are, but where I go and when I go there, water is harder to find.
So lately I've been focusing more on only partially dried items, like apple and pineapple rings, craisins, raisins, and nuts (dry but very oily). I'll make a baggie of whatever I want to throw together (I like variety) and bring a spoon. I eat that loose just like it was a bar, but with the spoon, and while it's not quite as convenient I find I drink half as much water when I'm eating. YMMV.