I learned to fly fixed wing first, in a PA12. With a private rating and less than 100 hours total time I transitioned to helicopter in an F28A Enstrom. I leaned both at the same airport, so I did not have to commute by air. I continued to fly fixed wing during my helicopter training, and never had an issue. Mainly I kept at both because I love to fly. You know what machine you are in, and you adjust. I say go with the airborne commute. Driving is so pedestrian.
IFMU