Google TV is unusable for 10-30s of refresh depending on how long it has been since you’ve used the TV. It’s the worst part of an otherwise high end TV. The multiple user UX is odd across Google products. You can haplessly sign in to your account for YouTube TV on another family member’s Google (TV) account without it bringing up an account switcher. About five minutes into you wondering why your settings are off (or being annoyed because you realized what happened) you get Google’s suggestion to press the right combination of buttons on the remote to do so. Then you switch accounts and sit through the 30s of account refresh. It’s death by a thousand cuts.
Roku is great. It does what you ask. Settings are remembered. The Roku Ultra 4K upscaler produces a great image. I used it to replace the Samsung experience on one of their first Gen OLED TVs that still produces a great image in spite of its slowly failing software stack.
Samsung seems to simply give up on updating the software on the TV at some point. Things start failing over time as services move on past your TV’s software stack. My newer Frame TV is on the newest software stack (for now) and everything works fine in comparison. Probably my biggest annoyance is the laggy UI and that they try really hard to direct you to their free TV channel. You were watching YouTube the last time you watched the TV, but nevermind that. Samsung wants to show you a loud TV show from the 50s on their classic TV channel. Or KPop. Or Hells Kitchen. Not sure why but that is what my Samsung TVs cycle through.