How to choose digital signage software for a simple use case when there are 600+ products
There are 600+ signage vendors out there, and they all do the same base thing: push content to a screen on a schedule. The features on top change from vendor to vendor, but the core is identical. So the real question isn't features, it's whether the vendor built things properly. A lot of them haven't: old stacks, dependencies untouched for years, security as an afterthought.
I'd filter on tech and security first.
Android is the most common platform, and it shows the tech problem well. Many vendors just give you an APK to sideload onto a smart TV, which is fine until you need to update it, because there's no way to push updates remotely. Then you're reinstalling by hand on every screen (if the vendor actually even updates it). The setups that hold up either use a proper store or a device in device-owner mode (which isn't the case on Android TV) with built-in OTA updates, which is rare.
Past that, the things worth comparing: how often it actually updates (new versions, patches, bug fixes, or frozen the day you bought it), how well it runs on your hardware, and whether it's a marketing company with tech bolted on or a real tech team building what they're good at. That last one usually predicts the rest.
This is also why I wouldn't dismiss the newer "vibe coded" apps. Something built quickly on a modern stack can easily beat an old product that gives you an app bundling an outdated version of Chromium to run on your Windows mini PC. Brand age isn't the same as being well built.
So for a simple setup: don't compare feature lists, compare how it updates, what it runs on, and who's behind it.