Advantages of solo cam. No TIMING. you still should do some optimizing of the cam, but it is less important.
All else being equal, solo cams seem to be quieter, and less recoil, and aims easier.
Advantages of dual cam. Easier on harness. Unless you get wide groove cam/wheel on a solo, it will wear the serving...not so on a dual cam. Faster...but only VERY slightly. Less worries about string stretch.
Other than that, it's a feel thing. There is NO differance in accuracy!!! Anyone who tells you that must think people can hold a bow steady as well. Solocams, and dual cams have BOTH won huge tournaments (Vegas etc) with the solo cams winning the vast majority of 3D (cause the have the most people shooting solo cams...2 cams CAN win 3-ds as well)
Let me say it again, so everyone is sure what I said and can flame me for it.
THERE IS NO DIFFERANCE IN ACCURACY!!!