i think muu would win easily.
1. land attacks uselss as he flies
2. deidara has no way of finding muu
3. dust release>all deidara's bombs
4. c4 karura is useless as he is a sensor and can sense the chakra in the bombs and fly out of range just like sasuke did
5. if deidara decides to blow himself up muu can fly high enough to get out of range as it goes at least 10km in all directions except up and mu moves fast or he can use dust to over power the attack
1. land attacks uselss as he flies
2. deidara has no way of finding muu
3. dust release>all deidara's bombs
4. c4 karura is useless as he is a sensor and can sense the chakra in the bombs and fly out of range just like sasuke did
5. if deidara decides to blow himself up muu can fly high enough to get out of range as it goes at least 10km in all directions except up and mu moves fast or he can use dust to over power the attack