If you intend to bridge the modem, then the CGN3 will be fine. As a bridged modem, the performance for both will be the same. If you intend to actually use the wifi on the modem, then yes, the CGN3ACR is a better choice as it should give you better perfomance on the 2.4 and 5 Ghz networks. If you have any devices that are 802.11ac capable, then yes, running the CGN3ACR is the modem that you should prefer. To be totally honest, you would proabably be better off running the modem in Bridge mode and use a good third party router for wifi purposes. If you are not terribly demanding in terms of wifi performance and utility such as port forwarding, the CNG3ACR should be okay for what you need. But, if you have specific requirements, such as parental controls, port forwarding, easy to modify guest accounts and much more, a third party router would be a better choice.