When comparing Nvidia Shield TV PRO vs Roku 4, the Slant community recommends Roku 4 for most people. In the question“What are the best set-top boxes?” Roku 4 is ranked 1st while Nvidia Shield TV PRO is ranked 4th.
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Pros
Pro Option to play a "silent" sound
It has a setting to keep emitting a "silence" sound, just to keep the soundbar (or audio system) awake.
Pro Powerful hardware
Better hardware than most other products running Android TV.
Pro Mount network storage
It can access remote storage (e.g. from NAS) using either SMB or NFS protocols.
Pro Optional Android app for a virtual remote control
There is an Android app that works as a remote control. In fact, the app can simulate either directional keys, or a virtual mouse using an on-screen touchpad.
Pro Remote can light itself up when picked up
You can configure the brightness of the backlight of the buttons of the remote. And such backlight will automatically turn on when it detects movement, and turn off seconds later.
Pro Built-in voice search
Pro Good 4K support
Pro Universal search
Roku's search will look through all available services and offer results in one place. You don't have to search through each app individually to find what you're looking for. It also remembers your previous searches.
Pro Offers the best selection of content
Roku offers more than 1800 entertainment channels.
Pro Simple, intuitive interface
Roku's interface is fairly straightforward.
Pro Headphone jack in the remote
You can plug in any set of headphones in the Roku's remote at which point Roku will mute the TV and allow you to listen to your content without disturbing anyone around you.
Pro Motion control capable remote
Cons
Con If you don't want 4K content, Roku 3 might get you more bang for the buck
Since 4K content is still scarce it might be better to get Roku 3 instead. It's practically identical to Roku 4 except for voice search and 4K support that Roku 3 lacks.