I'm new, too, just very randomly found this community and will join in a minute. I was glad that this question was the first I bumped into, however, I regret that only few people answered.
I love both novels to pieces (and was VERY disappointed with his third, I must add). Density was the first I've read, and it haunted me for a very long time, re-read it several times since. But also The Snow Garden. As he said, both had a very Hollywood ending, and Snow Garden was even more over the top if it's possible at all. But the characters were very well drawn and I chose this latter one to introduce to a friend first. I loved Stephen in Density, but I guess I even more loved Randall in Snow Garden because he was so tortured and still attractive. If you read this comment, pls tell me if you liked his third book at all, I'm just curious.