I really don't know as I haven't looked into it, but it is common belief. Personally, I use either and haven't noticed a difference.I pulled this regarding additional benefit:
Taking citrulline in the form of citrulline malate also provides the additional benefit of malate, which is involved in the Krebs cycle to generate energy aerobically in the form of ATP (adenosine triphosphate). ATP is the energy currency of every cell. In muscle cell it is used to fuel muscle contraction, such as during exercise. Research in exercising humans shows that citrulline malate significantly improves the amount of ATP that the muscles are able to regenerate and enhances the rate that phosphocreatine (PCr) is regenerated. One study reported that subjects consuming 6 grams of citrulline malate for 15 days experienced an increase in ATP production during exercise by 35% and a 20% increase in phosphocreatine recovery after exercise. Phosphocreatine is what creatine is converted into inside the muscle cells through the addition of a high-energy phosphate group. Creatine donates this phosphate group during intense exercise, such as weight lifting, to produce ATP quickly to power muscle contractions that are required to lift the weight. This means that supplementing with citrulline malate can increase endurance to allow you to go longer, but also allow you to recover faster between sets, helping you to complete more reps per set later in your workouts.
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