You can do either with Relay, although it all depends on what the carriers in the area are looking for. A majority of the carriers are looking for 1099 drivers, and a majority of drivers opt for 1099.
Relay is currently located in several cities and states across the country. To see if Relay has rolled out to your area, please use the following link: *link for them to check this*
As a driver on the Network, you will drive the trucks of the carriers that place the orders. After accepting a run, you will drive to the carrier's yard, park your car there, and use their truck & trailer for the run.
Relay offers benefits for Relay Drivers through the Upshift Perks & Benefits program. To learn more about Upshift, please use the following link: https://relayondemand.com/upshift/
To begin your application process, download the Relay On Demand app from the App Store or Google Play store and you will be able to see your checklist after logging into your driver account.