Your company came up as an authorized pfSense distributor. Can you illustrate the significant differences between the Netgate SG1100 and Netgate SG3100?
The main difference is going to be performance.
The SG-3100 is a faster system and can handle more throughput. It also has the capability of running some of the heavier packages such as snort more efficiently.
Beyond that, the SG-3100 has more ports. If you need more than three networks it is a bit easier to do with the SG-3100 than the SG-1100. You would need to break the switch out into networks using VLANs, there is a great walk-through on how to do just that here: https://docs.netgate.com/pfsense/en/latest/solutions/sg-3100/switch-overview.html