@JonR3
@renojim summed it up well.
I guess how you proceed depends on what it is you're after.
Roku is a streaming platform, as are Android/Google TV (which current Sony TVs use), Fire TV, and Apple TV. All of the Big Four streaming platforms are available as separate devices that attach to a TV, or (for Roku, Fire TV, and Android/Google TV) built in to a TV manufactured by others.
As @renojim said, the Roku Channel is simply a source of content, but as you have discovered, isn't available to Android/Google TV devices (assuming your Sony uses that platform).
Roku Channel is a free ad-supported service. It does offer premium subscriptions, which you would watch via Roku Channel.
If you already have a smart TV, you really don't need a Roku device, unless you want apps that are not available on your smart TV platform. Personally, I have Roku devices attached to all my smart TVs. This includes devices with built-in Fire TV and with built-in Android/Google TV. I prefer the platform.
To watch a platform on a different smart TV, you need a device with that platform. In your instance, if you want the Roku experience (not just Roku Channel, but all of the Roku menus and app availability) then you need a Roku on each TV.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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