xlr82v2, i agree that bigger is not always better but it just depends on your situation.
A smaller unit will be easier to manuever in tight spaces while a bigger unit will be more difficult.
A bigger unit will be heavier and get better traction, 5525 is about 800 lbs. heavier than the 3525 if you include the weight of the loader.
Same 3 pt. hitch lift capacities on both units
IMO the main differences are that the 5525 is 4 cyl and has 44
pto hp while the 3525 is 3 cyl. and has 27
pto hp.