A:Answer The 65S535 is a member of our 5-Series, and the 65R635 is a member of our 6-Series. Each series builds on each other. Both of these series are 4K UHD, have HDR support, have a Roku operating system, feature Dolby Vision support, wide color gamut, auto-game mode, an edge-to-edge glass display, QLED technology, CCZ, eARC, etc. The new 6-Series also features mini-LED technology, Variable Refresh Rate, THX Certified Game Mode, and more! You can also visit www.tcl.com/us/en/products/home-theater/6-series and scroll down to "Compare All Models" to see all models compared. Hope this helps! Thank you, TCL Customer Support
