Depends on the temperature. I like Clif bars but they get too hard to chew below 50 degrees. The Clif blocks have a bit more temperature range but can be very chewy below freezing. I also like to stash an almond butter sandwich in my bag for something not sweet. I also carry pretzels and crackers just to have something different.
I'll never forget my first experience with PowerBars. They had the consistency of road tar.