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Hello - it might be best to use the "Compare" feature on the site to do a side-by-side comparison. A quick comparison will show that the G36 is the newest technology - DOCSIS 3.1 modem, and Wi-Fi 6 router. Only DOCSIS 3.1 modems can achieve Gigabit speeds so if you subscribe to Gigabit speed plans, the older DOCSIS 3.0 modems won't achieve those speeds (the Motorola MB7621 is DOCSIS 3.0 and Wi-Fi 5). It really comes down to what speeds you subscribe to and how to get the most out of those speeds. Hope this helps.
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