Best answer: The Surface Dock can connect to the Surface Laptop 3 over Surface Connect, but it's not necessarily the best way to go anymore. Thanks to the USB-C port, you can use a more modern dock like the Dell D6000 Universal dock.
Surface Dock is long in the tooth
On the one hand, the Surface Dock is still fit for purpose because Microsoft equipped it with the first-party Surface Connect solution for hooking up to various Surface devices. The new Surface Laptop 3 has Surface Connect, and as such, the Surface Dock is still a compatible product.
But it's been out for quite some time now and is really in need of a refresh. It'll still allow you to hook up a pair of 4K external displays, but only using mini DisplayPort, a standard most have moved away from. And the Surface Dock's lack of HDMI is offputting for a lot of people.
It does provide additional full-sized USB ports and Ethernet, and one advantage is that it leaves the USB-C port on the laptop open to use with other accessories. By contrast, the Surface Dock won't work with any other PC you have access to, nor will it support any non-Surface device you may upgrade to in the future.
The Dell way
The Dell D6000 offers up to 65W of charging back to your device to keep it topped up, plus you get support for up to three 4K external displays if you're setting up at home or in the office. It's jam-packed with ports, including four USB-A 3.0, one USB-C, two DisplayPort, HDMI, a 3.5mm audio jack, and Ethernet. There's also a Kensington lock slot if you like to be extra secure.
Most importantly is that the Dell dock is comparably priced with the Surface Dock while offering more port selection as well as a more up to date port selection. DisplayPort is preferable over its mini-sized sibling, HDMI is always welcome, and just being able to add three displays compared to only two from the Surface Dock might be enough to swing it.
And you don't even surrender the USB-C slot since D6000 gives it to you back. It's a pretty standard looking black box, but as far as docks go, it's one of the best you can get.
Power and plenty of ports
If you're in search of a docking station with a brilliant selection of ports, the Dell D6000 is a wise choice.
A bit long in the tooth
You could get a Surface Dock, and it'll serve you well, but for similar money, you can get something better now.
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