Granted, NVMe SSDs are where it's at in this business. But add-in SATA3 based SSDs still can make a lot of sense for your movies, or game collection if priced right of course. 

BiWin, the company that makes HP SSDs (and other products), has now announced the HP S750 2.5-inch SSD Series. Available in 256GB, 512GB, and 1TB, these drives have been fitted with new 96-layer NAND and reach read speeds up to 560 MB/sec.  Even the smallest version reaches 520 MB/sec on writes with IOPS 4K writes being in an 80K range.

These SSDs are low lower, in idle they consume just 0.4 Watts and in full use roughly 2 Watts. The units are backed with a three-year warranty, the TBW values correspondingly in volume size are 160 TBW, 320 TBW, and 650 TBW for the 1TB model. I am awaiting confirmation on pricing.