Hands down, Led Zeppelin for me. I was always a big fan of their music. 
I never understood the fan worship of Stevie Nicks. Sure, she is a talented singer/songwriter but there are a lot of equally talented people out there.
Ruth
		
		
	 
At the time?  Not many female faces at the head of top bands. Fleetwood Mac achieved very rarely seen heights.  I don't think her solo career was anywhere as solid, but I think she had ascended much higher than most women ever had in a band.
		
 
		
	 
Well, this is just off the top of my head but in that same era I can think of these women who qualify:
Chrissie Hynde and The Pretenders
Janis Joplin and Big Brother and the Holding Company
Debbie Harry and Blondie
Grace Slick and Jefferson Airplane/Jefferson Starship/Starship
Gladys Knight and The Pips
Joan Jett and The Runaways
And these are just the ones who performed with bands. There were innumerable female singers/songwriters who were big hits as solo artists in that time.
Ruth