I only ask as that the liquid fuels are usually better but more volatile and hazardous to cart around, an oxidiser (liquid oxygen) and a fuel (kerosene).
Kero's ok to handle...not so liquid oxygen...also combining them incorrectly..."bang". Solid is much easier and ready to go at moments notice.
Did you see any gryo stabilised fin control? Looks like the big ones have some sort of control to make them head .....
Up!