Simply put, these are two very different devices. The ASUS AC3100 does not offer the same features. For one, it has basic TREND antivirus and some content control. It does not learn your home devices (think Nest thermostat, Dlink cameras, fridges, TV's and many other IoT devices). The performance of the AC3100 drops considerably when you enable the TREND security features by the way...do your homework as you say. The AC3100, while a high performance router, doesn't offer any real home security capabilities besides the included basic antivirus and content control.
Additionally, the AC3100 does not include licenses for other device protection like the Norton Core does with it's subscription. With Core you get additional protection for Notebooks, Desktops and Laptops, Mobile devices, etc. as part of the subscription.
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