Hi Mike,
It's only personal thoughts but I find the Marie Felling a little odd looking with the boat deck forward of the wheel house, and a little quirky.
It's not to say that I don't like it as a ship..I do....I just prefare the oldy worldy looks of a conventional tug layout a little more, as in the Imara.
Both use the same hull but to me ( and again I stress it is only a personal preference) the Marie Felling looked as though a child had designed the original layout on the 1930's with out actually seeing a real boat........as though it was an imaginary vision.
However I must say, that as for building, the Marie Felling, being the more quirkier of the two, is a more interesting boat to build( again in my own mind)
Have fun, and enjoy building what ever of the two you choose.