"Large" yachts are those that accommodate between 140 and 400 passengers, and feel more like small-scale cruise ships than pumped-up private yachts. These capacities are ideal for travelers who want an intimate experience but prefer sailing with more than a few dozen other people.
These ships are also a good bet if you don't like feeling the movement of the ocean; because they are larger, the ride is usually a bit smoother than small yacht options.
There are some nice perks when you sail a large yacht. First of all, you'll have more choice when it comes to cabins. Some cabins on large yachts will have balconies with sweeping ocean views, while none of the ships in the "Small Yacht" category offer accommodations with verandas. Most of the ships in this category also offer a variety of suites that give you more square footage, space to dine in your cabin and outdoor furniture to enjoy on your veranda. Ships from Silversea offer butler service with every stateroom, which equates to an ultra-luxurious experience for all.
 These larger ships offer more dining venues onboard. Silversea ships in this category, for example, offer three fine dining options -- The Restaurant main dining room, La Terrazza for authentic Italian flair, and specialty restaurant Le Champagne, featuring French cuisine -- in addition to the on-deck Pool Bar & Grill. Many lines -- including Windstar, Silversea and Paul Gauguin -- also stage elaborate BBQs on deck or on a beautiful stretch of beach.
The public areas of the ship offer more variety on a large yacht as well. You can expect amenities that could include at least two bars and even a standalone cigar lounge; a spa, beauty salon and full-fledged fitness center; a small theater; a casino; a library and internet/card room; and maybe even a small boutique selling clothing, jewelry and sundries.
Finally, these large yachts can visit some additional destinations that the small yachts can't visit safely (due to their size) but larger ships might be too big to access. Look for itineraries to the Arctic and Antarctica -- destinations that require larger ships with certain navigational equipment and strengthened hulls for sailing in areas where ice is prevalent. Large yachts also offer some compelling South Pacific itineraries.