I looked at both closely last year, found there was overlap in the prices as the years adjusted, but yes the express tended to be more expensive. As we got closer to making a decision, a couple of thoughts stuck - one was that the Marlin feels like a big little boat, and the express feels like a little big boat. Second was that it is rare for anyone to wish they had less boat.
After running the express for a year, I love the center helm set up. The boat has a great feel to it, though I'd love more power. It has proven to be manageable to run solo as the thruster makes it easier. One concern we had was bow access, but that turned out to be a non issue.