Even if you only have 100 Mbps internet, you still want to make sure your router and switches are 1 Gbps...
it will give you enough overhead in the connections, especially if you still want to transfer data from one device to another on your network.
I use Ubiquiti at home!
Will this be used for home or at work?
You might look in to the Ubiquiti line, such as the UDM Pro or UDM Pro SE:
https://store.ui.com/us/en/products/udm-pro
Cisco is usually used in corporations, so there may be licensing to pay to get some features.
Better to stay with prosumer if your needs aren't on a corporate level!
On a side note...
You are usually provisioned for the 1.2 Gbps.
If you get you a modem and a router that has a 2.5 Gbps port or higher, as well as your computer having it as well, you will get speed tests close to the 1.2 Gbps as well
uhhhh....
to get 10G speeds on your network!