I've used the Samsung 960 & 970 Pro extensively in 1st Gen Threadripper builds, usually anywhere between 4 and 8 per system and they are my go to drive. Simply for the best speeds, write endurance and warranty, but as they are used in mission critical applications they maybe over the top if it is just for a Steam drive.
If you are looking at 960GB/1TB drives there are a few options, the Samsung 970 Evo (Free copy of Assassins Creed: Odyssey from participating retailers atm), the ADATA SX8200 960GB, and the new Corsair Force MP510 960GB. The first two I've used, and would be more than happy to recommend, but the Corsair one is brand new and I've not hand any through my hands yet, but on paper they look as good as the Samsung (SLC cache size not disclosed however). Honestly the ADATA can be had for £210, and the Samsung is £50 more it's a hard choice, Corsair is right in the middle at £230. Flip a coin, or sell some Assasins Creed codes if you want the Samsung for less cash