Lets take 3 theoretical drives, using flash latencies from a google search of "Flash Read Latency".
Drive 1: Gen 3 drive of entirely low latency 3d SLC. 8 microsecond (us) read latency, 4,000MB /sec max transfer
Drive 2: Gen 4 drive of entirely 3d TLC. 75us read latency. 7,5000MB /sec max...