9 facts in comparison
ARRIS SURFboard G18 vs ARRIS SURFboard G20
Two SURFboard modem-router combinations that our tracked specifications cannot separate, which is itself the useful finding. Both are DOCSIS 3.1 cable gateways rated for a gigabit plan, both offer two gigabit Ethernet ports, both are certified for the same major US cable operators, and both are bought for the same reason: to replace a rented gateway with something you own.
Where they differ is in the detail the comparison table does not carry - the wireless class and the features of the router firmware. Arris positions the G20 a step above the G18 in its range, and a buyer choosing between them should check the wireless rating on the box rather than assume the higher number means a faster modem. The modem sides are the same DOCSIS 3.1 hardware in every respect our data records.
The practical consequence is that this decision is mostly about Wi-Fi in your particular house. Two ports is two ports; a gigabit is a gigabit; the only thing the extra money can buy is better wireless reach or a newer wireless standard, and how much that matters depends on floor plan and device count rather than anything on a spec sheet.
Both share the combination unit's usual compromise. The modem half of a DOCSIS 3.1 gateway will stay current for years; the router half will not, and it cannot be upgraded separately. Buyers who expect to want Wi-Fi 7 within the life of the box are better served by a plain modem and a separate router than by either of these.
If the difference in price is small, take the higher model for its wireless. If it is not, the G18 covers a gigabit plan in a modest home just as well, and the money is better kept for the next router.
Head-to-head points: every spec is scaled between these products only, so a product can score high here and modestly on its own page, where the VS Score measures it against the median of its class.
Where the ARRIS SURFboard G18 beats the ARRIS SURFboard G20
No standout advantages.
Where the ARRIS SURFboard G20 beats the ARRIS SURFboard G18
No standout advantages.
What matters to you?
Drag the sliders to weight each category and re-rank the products to suit your priorities.
Score breakdown
Performance
Connectivity
Features
Design
Specs last verified October 11, 2026ARRIS SURFboard G18: 9 of 13 specs verified (69%)ARRIS SURFboard G20: 9 of 13 specs verified (69%)Unverified specs show as Unknown — never estimated, never scored
What reviewers say
The bottom line
The ARRIS SURFboard G18 and the ARRIS SURFboard G20 are neck and neck, both scoring around 100 on our VS Score. With so little between them, your choice comes down to which strengths matter most to you.
