I like them both. Dark Star and Dazed And Confused are two songs with the most active musical evolution in the rock world. These two groups were maybe the most organic improvisers in rock. Thing is, Grateful Dead never tried a "brutally majestic" approach similar to Led Zeppelin, that's why they never attracted as many fans as Led Zeppelin. They didn't try approach their audiences with an "overlord" attitude, which some people do like. But I love both bands.