Is the 24 speed something you want? Nothing against it, but if you want the bigger loader then I would opt for the 12/12. You can always get where you are going with 12 speeds, but you may not be able to lift what you want with the smaller loader.
However, my friend has a 5525 with 542
FEL and it is plenty strong for the tractor. It can feel pretty unsteady when using the loader, especially with the narrow stance of the 5525.