Potentially lower upfront cost: The purchase price of an outboard engine can be less than that of an inboard engine. That’s not always the case, however. Larger outboards tend to be more expensive than their diesel counterparts.

Shorter life: Because they’re exposed to the elements, not protected inside an engine room, outboard engines may not last as long.

Easier to access: Due to their location right off the stern of your yacht, outboard engines are simple to access or remove for maintenance and repairs.

Possible performance/stability issues: Outboard engines must be located off the back of your yacht, which affects the center of gravity. That can lead to performance or stability problems.

Easier to trailer: Because you can simply lift the engines up, it’s less complicated to move a yacht with outboard engines from place to place.

No swimming or fishing off the back: The location of outboard engines also means you can’t use the back of your boat for recreational activities.

More noise: Outboard engines, particularly older models, tend to be noisier and smokier because they’re exposed.

Lower lifecycle costs: Most inboard engines are diesel-powered, which means your operating and maintenance expenses — including fuel costs — tend to be lower over time.

More complex maintenance: Due to their location inside an engine room, it’s not as easy to access or remove inboard engines for maintenance, repair or repower.

Long, reliable service life: Diesel engines are known for reliable performance and, when maintained properly, can last for decades. When it’s time to sell, the value of inboard engines (and therefore your yacht) is likely to be higher.

Transport challenges: Inboard engines may make your boat more difficult to trailer.

Greater flexibility: You choose where to install inboard engines (aft or midship, for example). That gives you more control over your yacht’s performance, stability and center of gravity.

Exhaust system requirements: Because inboard engines are located inside an enclosed engine room, you must install an exhaust system on your yacht.

Quieter: Inboard engines located in an isolated, insulated engine room keep noise to a minimum — an important factor if you’re entertaining on board.