Fastest SATA SSD For Mac In 2018 - Your Best Choice Is...
But here you have the Market Leader, the pretty much uncontested top of the Benchmark-Winner's heap: Samsung's Recent EVO Series - the SATA III 860 EVO as your optimal choice for a MacBook laptop or Mac desktop SSD upgrade - or for use in a Mac compatible external Thunderbolt or USB 3.0/3.1 DIY backup drive you can assemble in minutes.
There are also mSATA (below) and M.2 (above) form-factor 860 EVO SSD blades for those who want to build a compact 10Gbps USB 3.1 Gen2 USB-C or 5Gbps USB 3.0 external backup drive for MacOS, TimeMachine or other Mac file storage needs. All pretty much MAX-OUT the full bandwidth of 6Gbps SATA III interface. For better Read/Write performance you have to make the leap to PCIe interface NVMe drives featured elsewhere on this site.
For the extra 10 or 20 bucks of the Samsung drives over other brands, you'll get peak Read / Write speeds, mature firmware, highly efficient mapping and management of memory cells and a long 5 year warranty to reassure buyers they made the best choice. Simply stated, forget the rest, buy the best. You won't regret it.