If you like it, keep it. You will not find the same and you know what you have. On the other hand, you know what you have and you might want something else.... Depending on taste newer is not always better and when buying the same or similar, you'll get new problems that come with someone else's old boat.
Perhaps I might add that I would emtpy the fuel tank(s) too. Put some synthetic fuel in it (not much, just enough to fill the system up with it instead of the standard fuel). Change filters so the engines are clean inside and will not deteriorate. (we have big problems with diesel bacteria in normal diesel but also aging of regular gas (with bio/eco additives) is a problem after a few months (gets thick and deposits form a glaze in fuel lines/filters).
remove impellers. grease and leave (half) open the various taps and seacocks. Note that on many types water can be trapped inside. There are tricks to get that out or at least to prevent it from causing damage when freezing/defrosting. Stuff them all with some flexible material cloth, tape, caulk, whatever prevents critters from creeping in and still allows for expansion/contracting due to temperature changes.
perhaps take the pressure off the steering system (I know mine sweats which doesn't matter in normal use but if stored for years that can become a bit messy and is easy to prevent).
take notes of what you do and what you will have to do to get it going again so you won't forget an impeller, seacock, cable, how to wire the batteries. Believe me, I forgot even after one winter some of the wiring in the boat. mark it clearly (not just take pics, those will disappear in the big heap on your storage drives)
depending on the location and circumstances you might want to consider an air dryer that leaks into the sink (attach a short hose outside so it won't run along the hull and leave a mark) these can be small and don't use much electricity. Sailors use them here for winter storage without taking all the stuff out. If you go this way you may want to add some checking system as you have power available then anyway (like a simple watchdog that sends an sms in case of power failure or some other trigger) if you're into that sort of stuff. Best to drop by every so often of course.
Of course take out and away everything of value or that will deteriorate over time (pillows, curtains) and open all hatches.
Outside you may want to use something to protect the stainless steel fittings. Especially the screws and bolts. Can be simple white grease if it's going to be wrapped anyway. Helps against oxidation by condensation.
Or do like most seem to do: just do a winter preparation and skip a few summers... and fix whatever is broken afterwards.

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