Its really your preference. Using a Chromecast gives you the ability to upgrade/update things change. With a smart TV you are locked into whatever hardware/OS is included with the Smart TV. Should be no issue using both if you like the smart TV for certain aspects, but Chromecast for others.

Mar 27, 2020 Video & TV Cast | Chromecast - Apps on Google Play Video & TV Cast is the TOP Browser App for video streaming with 10,000,000 users on Android + iOS Upgrade your Chromecast Player to watch webvideos, online movies, IPTV, livestreams and live-tv shows directly on your biggest screen with the no#1 web video streamer. Mp4, m3u8, hls livestreams, video over https and of course Full HD are supported. Chromecast - 3rd Generation - Google Store Stream your favorite entertainment to your HDTV. Chromecast works with apps you love to stream content from your Pixel phone or Google Pixelbook. Chromecast Review: Is it Still Worth It in 2020 - Dignited Apr 22, 2020

A Chromecast is an HDMI device that you plug into your television. With the aid of the integrated WiFi receiver, the device can send content from a mobile device or laptop to your TV or monitor. This means you can send images and sound to your television from apps like Netlfix, Spotify, HBO, and Youtube with just one click. What is Smart Tv

Jul 02, 2019

If your smart TV already supports Google Cast, then there are no benefits; the Chromecast is redundant. If your smart TV does not support Google Cast though, then a Chromecast will add that feature to your TV.

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