Following the comments on the test method, I've run the 'Blackmagic Disk Speed Test'. The results are the following. Speed in MB/s HFS+ HFS+

Following the comments on the test method, I've run the 'Blackmagic Disk Speed Test'. The results are the following. Speed in MB/s HFS+ HFS+ Encrypted APFS APFS Encrypted read 513 513 508 506 write 477 460 478 432 The earlier results of 7 GB/s are quite impossible with the Samsung Evo Pro 850 -- those max out around 500 MB/s. So my earlier test results are invalid. The new test results mostly show that both file systems can saturate the disk's raw throughput. -- update On my internal Apple SSD (PCI-Express) I've created a partition for testing. I've kept "Blackmagic Disk Speed Test" running for a few minutes and took an average of the tests. The results are in favor of APFS, beating HFS+ by 3-17% in throughput. Speed in MB/s HFS+ HFS+ Encrypted APFS APFS Encrypted read 2400 2240 2700 (+13%) 2400 (+7%) write 1900 1930 2000 (+5%) 1980 (+3%)