The trio of early Yes albums (Fragile, Close to the Edge, Yessongs) were huge musical influences on me. And Steve Howe is one of the reasons I started playing guitar to begin with. I'm still a big Yes fan....
The Youngbloods were a cool band but I gotta go with Yes, up to Tales from Topographic Oceans.
Yes was my fav music to trip too back in the day so they get the nod for nostalgias sake if nothing else.