I've been using the NVIDIA Shield for a couple of weeks or so. As I mentioned several days back, the interface on the NVIDIA Shield didn't look exactly like the Chromecast interface. Close, but some differences. That surprised me.
Turns out that the Chromecast is running a newer version of Android TV OS, version 12, while the NVIDIA Shield runs version 11.
Of course, Android OS is what's underneath. The interface itself it separate. Chromecast uses the Google TV interface. NVIDIA Shield uses the Android TV interface. That's the reason for the different appearance.
Mind you, the differences aren't great, but the differences are enough that noticed it right off the bad. I like the Google TV interface better.
In the meantime, I'll continue to use the NVIDIA Shield as my primary box. Travel, being under the weather, and the holidays have interrupted by streaming habits. I'm going to use it for another week or two then give my thoughts on it. I like parts of it, but other parts I don't like. Over these next couple of weeks, I'll see just how much I like and don't like the various things.
My Streaming Life has usually involved using Roku. However, I've really enjoyed Chromecast, and some people I know have raved about the NVIDIA Shield. I understand why they like it. I'm not sure if I'll go back to Roku or not. But I do like Roku.