You mentioned the best one out there in your original post. From doing long hot grueling cycling I can tell you that Scratch is the best I've tried by far and I've tried most. Avoid gatorade completely imo. It will make you have sore stomach and most of the energy chews also will sit like a rock in your gut, including shot blocks and most other gels. Stick with Scratch Labs and for some quick snacks, Honey Stinger waffles are great. Those do not hurt stomach. If it works for cycling, it definately will work for hiking. Last thing you want it your stomach to feel heavy and painful or cramped.
If you don't have it yet, pick up the Feed Zone Cookbook available on Amazon.
Hope this helps.