Well yes you do get extra weapon skill and his special rules but as well as that you gain the advantage of having a combined profile which means in comparison to a prince on dragon he is much less likely to be killed or have his dragon killed by cannons and other artillery, also on the charge instead of having 4 strength 7 attacks from the prince and 7 strength 7 attacks from the dragon you have 10 strength 10 attacks flat, he also gains murderous prowess so he is almost guarantee that whatever he hits will die.
Another benefit is that if he is charged he will have 10 strength 7 attacks ASF most of the time rerolling hits and wounds, whereas a prince would have only strength 4 attacks, so he is harder to kill than a prince with an extra WS and murderous prowess, not amazing but I'd say that's pretty good for what he costs.
CS out
Another benefit is that if he is charged he will have 10 strength 7 attacks ASF most of the time rerolling hits and wounds, whereas a prince would have only strength 4 attacks, so he is harder to kill than a prince with an extra WS and murderous prowess, not amazing but I'd say that's pretty good for what he costs.
CS out
best way to do Karl in is to send the eternity king after him, shadow magic + asuryath = dead Karl frank and a griffon feather bed for malekith
