I think that in this one it really comes down to who pulls out thier trump card first. thier elemental status and abilties will nullify the majority of thier attacks. Deidara can attack from the air, as said above, so he has an advantage from that. However, Kakashi, like sauske, is quite proficient with lightning so he can neutralize the bombs. so it comes down to whoever pulls out thier trump card first would win. if at same time then i say kakashi would win becuase he would be able to warp out deidara's head before he can set off the mini bombs. so yea. TRUMP CARD WINS ALL!!!!