Is SD-WAN Right For Us?

I work for a company that has about 60 remote sites. Each site has an IPSec tunnel up to our main datacenter with untapped bandwidth.

Throughout the country, we have varying lines from 500/500 fiber to simple 100/25 coax lines. We ALWAYS go with fiber if that is an option, and I would say more than 35% of our company is on fiber.

All our remote sites spread across the country but ALL send into our main data hub. Our data is mainly a singular application sending dozens of terabytes of data a day.

We have been looking at SD-WAN because it is an embedded feature in our FortiGate firewalls. The problem is, it seems like there are several flavors of SD-WAN, and none of us have a good grasp on what it will do.

The way we see it, could SD-WAN be a way to create a mesh WAN in which we can direct routes across the coast through low-latent nodes, effectively making traffic quicker? We see latency as the #1 culprit to performance that can absolutely effect a lot of areas of our business. We also have a very good grasp on latency metrics and what paths we would want to take, but we're not sure if we are looking at it correctly.

Can anyone with experience help me understand if SD-WAN is a useful application for what we are trying to do?