Gateway

You would lose some pay-features like the remote-control 'xFi' stuff as well as rather excellent comcast apps/GUIs/software.   I opt out of it all since it costs extra but I am always impressed by their software & system offerings.     Many of the xfinity features are available for free in various aftermarket router/wifi/hubs, along with some extras.  It's case-by-case pairwise comparison between whichever revision xfinity router/wifi/hub and whichever retail router/wifi/hub you are considering.   Consider to obtain a side-by-side comparison of full-feature-lists for device which you are comparing and possibly highlight the features you care most about.     Also it is most versatile for future-proofing and testing to own a cable-modem as a separate device rather than integrated into your owned router/wifi/hub.