The Beneteau First 435 1984 vs Beneteau Oceanis 45 2011 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.
On paper these two are close siblings in the size department - Beneteau First 435 1984 at 44,7 ft versus Beneteau Oceanis 45 2011 at 45,9 ft. Weight tells a clearer story for trailering families: the Beneteau First 435 1984 tips the scales at 23 810 lbs - 553 lbs more than the Beneteau Oceanis 45 2011 at 23 257 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 Beneteau Oceanis 45 2011 tops out at 54 hp. Engine specs for the Beneteau First 435 1984 aren't listed - confirm with a dealer before selecting an outboard.Both carry nearly identical fuel loads - 52 gal and 53 gal - so range won't be a tiebreaker here.
Both boats are rated for 13 passengers - a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.
Both boats sit in a similar displacement bracket - 23 810 lbs for the Beneteau First 435 1984 and 23 257 lbs for the Beneteau Oceanis 45 2011. Comparable displacement means broadly similar seakeeping behaviour and load capacity, though hull form and ballast ratio will still produce noticeably different sailing characteristics.
Both boats draw a similar depth - 7,6 ft and 7,5 ft respectively. Marina access and anchorage options should be broadly equivalent between the two.
The Beneteau First 435 1984 uses Sloop rigging. Helm style differs too: the Beneteau First 435 1984 uses a 1 wheel versus a 2 wheels on the Beneteau Oceanis 45 2011. Wheel helms give better leverage and visibility on larger boats; tillers offer direct feedback and simplicity on smaller ones. The Beneteau Oceanis 45 2011 has a documented auxiliary engine of 54 hp.
Hull speed is rated at 8,7 knots for the Beneteau Oceanis 45 2011 and 8,1 knots for the Beneteau First 435 1984. For extended cruising, water capacity matters: the Beneteau First 435 1984 carries 127 gallons versus 98 gallons on the Beneteau Oceanis 45 2011 - a significant advantage on longer passages where watermaker or provisioning stops aren't guaranteed.
Bottom line: The Beneteau First 435 1984 and Beneteau Oceanis 45 2011 are closely matched on paper. A sea trial on both in representative conditions is the only reliable way to find which one suits your sailing style, home port, and intended cruising ground.