I will say tonfa. I have been teaching myself Tonfa for about three years now, and they are amazing to work with. The basic techniques are based off of normal strikes and blocks, while the advanced techniques are more specialized to the weapon. The spinning and trapping techniques are very rewarding to learn, as well as being very effective (if you believe that weapons have a practical use now). Finally, training with tonfa increase your hand and arm strength and dexterity a lot, and will help your unarmed technique.