There is actually one other difference that I can think of, and that is the LED behavior. Granted, not a functional problem and more cosmetic, but it might really bug people who are a bit OCD, especially if mixing SAS/SATA drives.The only difference between the "A" backplane (6x 8087 connectors) vs "TQ" backplane (24x individual SATA connectors and 6x sideband connectors) is cabling.
we've discussed this in some other threads so i'll just link here:
https://forums.servethehome.com/ind...haviors-differ-with-sas-vs-sata-drives.19042/