I have a second generation Chromecast on an old TV that only does 1080p. I'm fine with that, I don't care about the resolution. Someone told me that I might like the new one with Google TV, but I don't know much about it. I pretty much just cast from apps on my phone, so I'm not sure if there's any reason to upgrade. The only thing I don't like is sometimes the Chromecast icon doesn't show up and I have to restart the app, but I doubt that's on the Chromecast end.
Overall, I'm pretty satisfied with what I have, but I've been looking at comparison websites and they aren't really telling me what I need to know, which is if I'm missing something good I shouldn't be missing.
Also, this is not really important, but I'm on Chrome and Google thinks "Chromecast" is a misspelling.
I prefer the remote and the suggestions are often pretty good. I rarely ever cast anything.
If you’ve ever thought a Roku, fire stick, Nvidia Shield or another streaming box looked interesting then there’s not much reason not to. If you’re planning to cast from the phone I wouldn’t bother upgrading.