Well, Swift does have a flatbed division and their Sprinter van division. That would be the only reason why I would go to Swift.
Werner has flat's too. A bulk and tank division that Swift doesn't. Swift does have a wrecker division to pick up all the Swift trucks that don't make it. IDK about Werner. I still don't know what end of the turd to go for.
Swifts make a big triangle...bus chassis from SC to IN, coils from IN,OHto Laredo and Sprinter vans and Freightliner parts from Laredo to SC.
Welcome to trucking. The company that first hires you will most likely not be the one you are working for 2 years down the road. The companies you have listed all have lots of people who no longer believe in them. But lots of folks do. Personally, I have never worked for any of them. I would not recommend Werner because they seem to be proud of the fact they started the ELD's. Just take the one that pays the best and start looking for a real company.