If you want to separate your energy from your hydration, then 5+ hours of maple syrup has been fine with me taste- and gut-wise, in hot and cold conditions. It doesn’t freeze in riding conditions, though it may slush.
It’s twice the weight of sugar for the same 100g of carbs. But, I presume most gels are similar in carb:weight ratio because they all need water.
So, if you’re going to carry food, then the extra weight in your pockets or bag isn’t a factor.
If you carry sugar (or other powdered carb mix), it’s lighter but obviously requires a quick stop and mix, and it’s generally locked into your hydration even if you adjust on the go.
