The Delphia Yachts Delphia 31 - Centerboard (Trunk) Centerboard (Trunk) 2012 vs Delphia Yachts Delphia 34 - Centerboard (Trunk) Centerboard (Trunk) 2014 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 — Delphia Yachts Delphia 31 - Centerboard (Trunk) Centerboard (Trunk) 2012 at 32,4 ft versus Delphia Yachts Delphia 34 - Centerboard (Trunk) Centerboard (Trunk) 2014 at 34,0 ft. Weight tells a clearer story for trailering families: the Delphia Yachts Delphia 31 - Centerboard (Trunk) Centerboard (Trunk) 2012 tips the scales at 11 464 lbs — 441 lbs more than the Delphia Yachts Delphia 34 - Centerboard (Trunk) Centerboard (Trunk) 2014 at 11 023 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.
For family outings this is probably the sharpest distinction between the two. The Delphia Yachts Delphia 34 - Centerboard (Trunk) Centerboard (Trunk) 2014 is rated for 10 passengers, while the Delphia Yachts Delphia 31 - Centerboard (Trunk) Centerboard (Trunk) 2012 caps at 9. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Delphia Yachts Delphia 34 - Centerboard (Trunk) Centerboard (Trunk) 2014 could be the deciding factor.
Both boats sit in a similar displacement bracket — 11 464 lbs for the Delphia Yachts Delphia 31 - Centerboard (Trunk) Centerboard (Trunk) 2012 and 11 023 lbs for the Delphia Yachts Delphia 34 - Centerboard (Trunk) Centerboard (Trunk) 2014. Comparable displacement means broadly similar seakeeping behaviour and load capacity, though hull form and ballast ratio will still produce noticeably different sailing characteristics.
The Delphia Yachts Delphia 31 - Centerboard (Trunk) Centerboard (Trunk) 2012 uses Sloop rigging.
Bottom line: The Delphia Yachts Delphia 31 - Centerboard (Trunk) Centerboard (Trunk) 2012 and Delphia Yachts Delphia 34 - Centerboard (Trunk) Centerboard (Trunk) 2014 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.