Zeppelin was all over the radio when I was in JHS and HS, and in part I was inspired by their music to take up playing guitar in the mid 1970s. My younger brother plays the drums and he loved Neil Peart, so I got into Rush a bit later through him. We both had bands, etc. and eventually went our separate ways, but we always found some time to jam on Limelight, Circumstances, Rock and Roll and others when together.
My brother turned his sons on to Rush and he took them to see the R40 tour, about which they rave to this day, while I think Zeppelin in part turned me on to Indian and Arabic musics, which I still love today. In college I jammed on Black Mountain Side with an exchange student from India who played tablas, and when I first listened to Umm Kulthum with an Egyptian exchange student in university, I heard an echo of the roots of some Led Zeppelin tunes. So, as with others in this thread, it’s difficult for me to favor one of these bands over the other.