My basic knowledge and experience is that carbs are going to give you a more sustained source of energy pre-workout.
Totally useless info, but I always feel my best workouts are after oatmeal.
However, there's a lot of research/trends that steer away from that concept right now. To me it seems like most people get caught up in that for the sake of bro-ing their roommates. I usually just stick to "I need to eat something or this is going to suck."
I know a guy who eats beef jerky exclusively on 3hr rides. Seems to workout.
I can continue these useless bits of info.
proteins can be used for energy .The amino group is stripped off ( oxidative deamination ) and transferrred to an acceptor.The deaminated amino acid is now a keto acid that is a carbon skeleton. Of the 20 common amino acids 14 of them give a carbon skeleton that cab be used to make glucose .....4 of the others make one fragment for glucose and one fragment for fat. ( acetyl CoA or acetoacetyl CoA ). Only two common amino acids produce carbon skeletons that produce only acetyl or acetoacetyl CoA viz., leucine and lysine. The liver is quite able to o make GLUCOSE for blood glucose and tissue energy from the amino acid alanine ( from muscle )which is deaminated to pyruvate..and thence to glucose. Since one must have carbohydrate or a precursor of carbohydrate to burn fat...when carbs are low ( such as in Adkin's dieet ) then protein/amino acids will supply the carb skeletons to burn fats . Even chain fatty acids cannot produce any glucose .
Ph.D. Biochem BS Chem
wonder how correct that is. seems like it's saying if you don't have carbs, then you need protein for energy because it makes the carb skeletons for fat, and I guess if you don't have it, it will use your muscles! But if you're a workout dude, you would want those proteins to build muscle, so you'd need carbs.