Engines don't use more fuel because they are larger. They us more fuel if you go faster or have a heavier boat.
For extended living an aft cabin is IMO preferable to a master in the bow. The best answer to your question however has nothing to do with boat types. A happy Captain always buys what his wife wants. Make sure she sees a lot of different designs before deciding. Spend time pretending you are doing the normal life things on them and see how they fit. e.g. a low overhead where you bump your head sitting up in bed or must clime over each other to get up quickly becomes apparent if you do more than look. Sleek and sexy may not turn out to be the most livable
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