There's no study work that formally answers your question that I know of and, of course, it probably depends on dosage. But imo L-Citrulline has more horsepower than L-Arginine gram-for-gram by quite a margin with most men. Futhermore, I have received more comments from men on the power of Citrulline.
Of course, your experience was the opposite and so you can try the L-Arginine. There are some studies - and I cover this in some detail in my latest book - that show that men with blood sugar issues are really helped by even small amounts of L-Arginine. Now if L-Citrulline did not help you, I kind of doubt that L-Arginine will either, because they are both doing the same general thing for erectile strength. However, Arginine is very inexpensive and so you have little to lose by trying it.
Let us know if you try it if you noticed any difference.
CAUTION; Do not take more than a few grams per day of L-Arginine and, of course, talk to your doc first. Also, here is something you should read about Arginine:http://www.peaktestosterone.com/Herpes_Arginine