Karen Bergquist is simply a much better singer, technically, to begin with. Add in her emotional intensity, the quality of both the songs and accompaniment and I’d agree that "lightweight" would describe how I. Mission sound to me. Of course, others may disagree. As mentioned, I also love the piano playing on OTR records. Hardly virtuosic yet immensely satisfying.
That’s still my favorite, so far. I’m like a blank sheet of paper that, dropped into that album, becomes effortlessly and wholly saturated. My favorite type of listening experience!