The two schools defend themselves very well and complement each other, they have their advantages and disadvantages...
On a new construction, you will have the "privilege" to choose your version.
You choose your finishes and your equipment, a unit to your image ; benefiting from the latest technologies and equipment on the market, you will have the guaranty of a certain tranquility for several years as long as you follow up and maintain it in a serious way.
On large units, the captain will be able to act as a project manager, he will know the boat perfectly in following its manufacturing process, the passage of cables, pipes, secrets under floors, engine rooms ; a handover by the builder or the dealer will help to do the handover smoother, as soon as launched and of course there is the manufacturer’s warranty which can be 1 year, may be 2, and even 5 to 10 for the structure at some shipyards.
The inconvenient is that the cost is irreparably high and an important depreciation the first 5 years ...
The market of brokerage...
It has the merit to offer you a product ready to sail away, generally proved and "debugged"; the survey you will entrust to a professional expert will allow you to know the potential risks and the possible costs of an upgrade: it is often electronic, the replacement of engines, redoing upholstery, changing sails .. Provided that you make the choice of a serious expert and who has the knowledge of multihulls because the structure deserves a special attention !
You do not have the apprehension of the wating of the construction and the associated hazards, delay or financial fragility of the builder, and the prices remain much more accessible. Certainly you don’t have the latest electronics screen, or the latest battery technology, but from the moment the boat runs properly and is reliable, there is no hurry to replace what is not necessary on a security point of view.
On the resale side, most of these units have already reached their best market value ; properly maintained you can hope to resell your multihull in optimal conditions, see close to your acquisition price ...
New or new ?
The first will require patience with comfortable and flexible budget, because of the additions to be expected during building and after delivery ; the second will allow you to define from the purchase a budget of refit and upgrades, to enjoy her right away and resell without losing too much money ...