I'm never really able to choose between these two. When I watch S1 I enjoy ML's performance and when I watch the others I enjoy JW.
I do have to confess to having a sneaking liking for JW generally just because of a guest performance he made in an episode of my other all time favourite show, The Young Riders. He was absolutely superb in that and I saw that before I saw LNC. So if they were going to replace ML I was kind of happy they chose JW to do it.
LabRat