There are two Godsend albums that Dan appeared on: As The Shadows Fall (1993) and A Wayfaerer's Tears (1996?). Dan does all the vocals on both albums, as a guest musician. His vocals sound fine, but I am not a fan of the music he had to sing over, which isn't surprising, because Dan wasn't responsible for the songwriting on either album. One of the only Dan-related projects I could never really get into.
As for the comparisons, I dunno, it's not slow/plodding doom by any means, it's kinda upbeat in places. And the second album has a few pro-Christianity messages in it, which may offend/turn away some folks. Check them out, they aren't bad...just not my thing.