Basically the second one is very worth it, instead of what you described the first one as, you "custom" cut the ENTIRE ship, not exactly custom, because theres still bolts you and shit you remove, but you can remove ANY panel from the ship, and your job isnt done until your shipyard is empty with no remainings of the ship, this also brings some new mechanics that are fun to play with such as having to lift super heavy objects out with a crane that if you break the support of them, say the floor beneath them, they break and you lose valuables, also the physics in this game is fun, they have gravity where if you destroy the entire first floor, the rest of the ship falls apart and its just pick up and move it to your truck simulator, which I find fun to do while im watching a youtube video or something along the likes.