There is a difference
I had the S4 and it was a good phone. Problem was the bloatware which just killed the user experience. I had a 64 gig card which is great for storage of songs and video, but not necessarily for apps and data storage. That depends upon the carrier. To me the Samsungs are nice phones but do not make my life easy. They do not synch with Outlook (or didn't when i had the S4), you are at the mercy of the service provider for o/s upgrades and not all upgrades are the same. Putting any type of file on a card means slower performance too. For me, life is a lot easier with the iPhone-something i never thought i would say.