The Beneteau First 21.7 S 2004 vs Beneteau Oceanis 400 1997 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.
Size is the most obvious dividing line here. The Beneteau Oceanis 400 1997 measures 39,1 feet overall (1997), giving it roughly 19,0 additional feet of deck space compared to the Beneteau First 21.7 S 2004 at 20,1 feet (2004). Weight tells a clearer story for trailering families: the Beneteau Oceanis 400 1997 tips the scales at 16 001 lbs — 13 257 lbs less than the Beneteau First 21.7 S 2004 at 2 744 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
The power gap is worth calling out. Rated to 50 hp, the Beneteau Oceanis 400 1997 has a 30-hp advantage over the Beneteau First 21.7 S 2004's 20-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Beneteau Oceanis 400 1997 carries 40 gallons versus 8 gallons in the Beneteau First 21.7 S 2004. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Beneteau Oceanis 400 1997 is rated for 11 passengers, while the Beneteau First 21.7 S 2004 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Beneteau Oceanis 400 1997 could be the deciding factor.
Displacement is where these two sailboats genuinely part ways. The Beneteau Oceanis 400 1997 displaces 16 001 lbs — a 13 257-lb difference over the Beneteau First 21.7 S 2004 at 2 744 lbs. That gap separates two entirely different categories of sailing: the heavier boat is built for offshore passage-making and load-carrying, while the lighter hull rewards performance sailing and easier handling in lighter air.
Both boats draw a similar depth — 6,0 ft and 5,6 ft respectively. Marina access and anchorage options should be broadly equivalent between the two.
For auxiliary power the Beneteau Oceanis 400 1997 carries a 50-hp engine against 20 hp on the Beneteau First 21.7 S 2004. Motoring range and ability to punch through a foul current or enter a tight marina under power will favour the more powerful installation.
Bottom line: The Beneteau Oceanis 400 1997 is the offshore and bluewater choice — at 16 001 lbs displacement and 39 ft it has the load capacity, range, and seakeeping for extended passages. The Beneteau First 21.7 S 2004 at 2 744 lbs is the more nimble, accessible option — easier to single-hand and better suited to coastal and inland sailing.