From what I can tell both delay line memory and dynamic random access memory both work in a similar matter, such that they both are refreshable memory. Refreshable memory is a process of periodic checking of new information from the memory and rewriting the information without no modification. But the main difference between delay line memory and dynamic random access memory, and the reason why dynamic would be superior is that dynamic works with random access, and delay line works in a sequential access. Random access is the ability to access information in equal time apposed to sequential access where information would be accessed in order much like a tape. Where if you would want to listen to a song in a tape, you would have to pass many songs, and in a cd you can just skip songs like random access. Today DRAM is most commonly used in most computers and only having to compete with flash memory. During the tour we saw DRAM plates being stored in a clear box, where the box would go through various stations before it would be completed.
