Both equally I think one compliments the other , Nick's has the more unique vocal but on her own can be a little fatiguing .
There previous album named just FLEETWOOD MAC is equally as good an album but most seem to jump strait to rumours and to their loss.
I saw them live in Leeds doing the Rumours in its intirety, it was a great concert. I have also seen a cover band called Rumours of Fleetwood Mac
who although i'm not the biggest fan of cover bands I can completely recommend the 2 female vocalists in the band did a very good job , the male singer though
put in a great performance but sounded nothing like Lyndsey Buckingham .
Avoid the Buckingham / McVee album though it is to be polite PANTS .