If you are interested in gaming or streaming, I would recommend using a router with a high end processor as to avoid any lagging. Using a VPN will also cause some slowdown, as your connection will have to tunnel to the VPN server and back.
As far as strength and range goes, our best router overall is the Asus RT-AC5300. It has 8 high powered external antennas and an ultra powerful 1.4 GHz processor which makes this model our most high end. It's great for gaming, 4k streaming, and can handle multiple devices simultaneously.