As David noted, Delphi compilation is usually disk bound. The most likely explanation is that your SSDs are in various states of "break-in". Even the exact same SSD will perform differently over its lifecycle. Fresh out of the box SSDs have extremely high peak performance that degrades dramatically as the drive starts to build up a use-history. Especially with rather new systems you will see that the SSD performance will change rapidly until the drive is "broken in" and settles at a roughly steady state level.
Many other factors can affect SSD performance as well and a raw benchmark will not reproduce the real-world conditions that can affect the drive's ability leverage its cache or other available performance optimizations.
If you're really interested, this is a good read from the Storage Networking Industry Association on the topic :
Understanding SSD Performance Using the SNIA SSS Performance Test Specification