Miss Martian would pretty much be their savior. The rest of them Kinda suck. Connor STILL doesn't know how to use his powers. Once they mopped the floor with the rest of the Team they could just Gang up on M'gann. If anything the only real advantage YJ has is their brain-power. Between Nightwing, Aqualad, and maybe Barbara they could probably think up a plan to make this a draw. But otherwise Spartoi wins. Spartoi even has a more impressive list of feats than YJ. They could probably win w/ brute force alone. Everyone on YJ would be KO'd except for maybe Connor.
@YoungJustice: You know what soul hack would be useless but this would should work
Noise Cancelling - Soul Hack: Generally speaking, this ability allows Soul to transmit Soul Wavelengths like sound, at first requiring the piano in the Black Room to do so. This has a variety of affects, such as paralyzing a foe by slowing down their Soul Wavelength, transmitting Madness, or controlling enemy attacks. Through Noise Cancelling Soul can create a Sound Shock