TEXRail is the clean rail comparison
DFW Airport publishes TEXRail as the Fort Worth-facing rail service, running between downtown Fort Worth and DFW Terminal B through North Richland Hills and Grapevine. That can be a strong public-transit option when the traveler has light bags, the schedule works, and the final Fort Worth destination is close enough to the station.
TRE is useful but less direct for many airport trips
TRE connects Dallas and Fort Worth through CentrePort/DFW Airport Station, and DFW publishes the TRE Link shuttle connection to the terminal. For a traveler landing at DFW and heading to Fort Worth, that means the practical trip includes terminal movement, shuttle timing, train schedule, and the final Fort Worth connection. It is workable, but it is a chain.
Private car wins when Fort Worth is a door, not a station
Fort Worth trips often end at a hotel, residence, Stockyards plan, convention schedule, restaurant, or event venue. A private-car quote should use the exact destination, not just 'Fort Worth,' because downtown, Stockyards, Cultural District, university, and arena-area arrivals can create different loading and return needs.
Event timing should be quoted both ways
If the DFW to Fort Worth transfer is tied to a convention, sports event, concert, wedding, or dinner reservation, the return is often harder than the arrival. The quote should state pickup timing, hold or return plan, wait policy, parking or staging assumptions, passenger-release timing, and who can approve a schedule change.