Iron on vs. Screen printing

So a friend of mine asked what the difference is between the iron on shirts and the screen printed shirts (besides the obvious price difference). Here it is: screen printed shirts are the types of shirts you buy in the store. They have the same durability and will maintain the print quality indefinitely just as any tshirt would. Iron on shirts, although they will last, may fade more quickly and may have "cracking" of the design that you won't get with the screen printed shirts. They require special care to last longer. We are moving towards screen printing for all shirts but screen printing is more expensive so we are doing it one design at a time.