No real difference, they're a waste of money. Meds dont do anything until the ich falls off the fish and hatches later from the cycst. The ONLY way to get rid of ich is to speed the life cycle.
Slowly turn the heat up to 84-86 degrees and lower the water level to increase aeration. You should also do LIGHT gravel vacs every other day to pick up any cycsts in the substrate. You will start to see it rapidly going away in 2-3 days. Once its completely gone leave the heat up for another week or two just incase.
*** Forgot to mention that during this you should also add Melafix or Aquarium Salt to help your fish heal faster and prevent any secondary infections.***
Jimmy