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@DFP
Any kind of glucose rich energy drink/gel will ellicit a strong insulin spike which will make you feel drained and tired and your body converts it all into stored fat. Will basically make you want to sleep.
Carbs taken for endurance activities should be extremely diluted (and electrolytes for that matter). Sugars mixed with fat will release energy slowly. But some people get tired when eating high fat stuff. Proteins will leave you feeling satiated for the longest but for some people, they also have the tiredness issue as fat and protein both takes more energy to digest. But a supply of protein will prevent catabolism issues assosiated with endurance activity.
Its worth experimenting, but prior to sports some kind of slowly digesting carb will probably be most universally suitable. Also, restaining yourself to only a modest amount in one go (big portions of even complex carbs can spike your insulin) I on the hand, cannot do anything without a hefty fat & protein laden meal before hand.