If you want an all in one easy to use Router, Firewall and Access Point than Google OnHub is a good choice.
If you want to run a more powerful system with security features than try PFsense. I've been running PFsense SG-2220 Security Gateway appliance for 9 months and it has been solid using only 8 watts.
here is a post by PCGamer reviewing OnHub and preferring the use of PFsense.
For my home office I use Ubiquiti access points. I have two in the main house. I could use one, but the data center DNA has me wired to prefer redundancy. Then one in the office. And another in the beach house. Single SSID. Automatic frequency configuration. And all kinds of good monitoring so I know things are working.
Why the focus on monitoring? Because monitoring fits in a more secure solution.
InfoWorld wrote a review of PFSense.