Man, at 14, I dont know if you really need either. Youre loaded with energy anyway. But if youre set on picking one up, Jacked wins hands down. Almost every guy whos tried both will tell you the same thing. Its cheaper, works well, its cleaner, zero calories, and it will work wonders for you. You actually might try a good protein/creatine stack if youre not already. I ould give those a shot before Jacked, youll see better results.

At 14 I would suggest not using either one. Your body should not be taking in the 300g of caffeine per serving size of either product (that is the same amount of caffeine in 8-10 cups of coffee). If you are looking for a good workout performance, I would suggest just creatine and some arginine. Arginine is 90% of these "pumping" products because it increases your Nitric Oxide levels and increases bloodflow as well as helps protein synthesis. Arginine and creatine are also naturally occuring substances found in almost everything you eat but in very small amounts so they are not as bad to your overall health as a stim such as caffeine. If you take 2-3g of arginine before your workout and some creatine with a protein shake right afterwards, you will see great progress with the crashing effects of caffeine. Caffeine is WIDELY over-used and should be taken very moderatly for younger individuals as it impacts your entire nervous system. If you are looking for a good "non-stim" pre-workout drink, check out the forums section as there is good info in there.