>>15702639
SATA/SAS is a descendant of the old IDE/SCSI/FC-AL busses designed for HDDs and other rotating storage devices back in the 1980s, and as a consequence is built with them in mind both in terms of raw throughput limits and command language.
PCIe is the native bus used to attach solid-state components on the motherboard itself together, such as CPU, GPU, NIC, and indeed SATA interfaces.
Newer SSD interfaces such as M.2 allow SSDs to attach directly to PCIe as first-class devices.
>>15702765
>it isn't clear whatever it's better or not?
Open your eyes man, "precautionary principle" only applies when evidence for both sides is inconclusive. In the case of SSD speed superiority, the evidence is WAY beyond conclusive.
>I don't remember clearly what it spoke exactly, but […] I remember that the general idea was that SSD have speed consistency issues
Look at my links, and notice that they include min, max, and consistency ratings on every metric, because they're drawn from tens or hundreds of user-submitted benchmarks, and the numbers for SSDs in all of those are somewhere between comfortably higher and stratospheric compared to HDDs.