The Catalina Yachts Catalina 30 MkII - Wing Keel Wing Keel 1986 vs Catalina Yachts Catalina 315 - Wing Keel Wing Keel 2012 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 — Catalina Yachts Catalina 30 MkII - Wing Keel Wing Keel 1986 at 29,1 ft versus Catalina Yachts Catalina 315 - Wing Keel Wing Keel 2012 at 31,1 ft. Weight tells a clearer story for trailering families: the Catalina Yachts Catalina 315 - Wing Keel Wing Keel 2012 tips the scales at 10 600 lbs — 300 lbs less than the Catalina Yachts Catalina 30 MkII - Wing Keel Wing Keel 1986 at 10 300 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 Catalina Yachts Catalina 315 - Wing Keel Wing Keel 2012 is rated for 9 passengers, while the Catalina Yachts Catalina 30 MkII - Wing Keel Wing Keel 1986 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Catalina Yachts Catalina 315 - Wing Keel Wing Keel 2012 could be the deciding factor.
Both boats sit in a similar displacement bracket — 10 300 lbs for the Catalina Yachts Catalina 30 MkII - Wing Keel Wing Keel 1986 and 10 600 lbs for the Catalina Yachts Catalina 315 - Wing Keel Wing Keel 2012. Comparable displacement means broadly similar seakeeping behaviour and load capacity, though hull form and ballast ratio will still produce noticeably different sailing characteristics.
Draft is a practical consideration that many buyers underestimate until they're already at the marina. The Catalina Yachts Catalina 315 - Wing Keel Wing Keel 2012 draws 4,4 ft, compared to 3,1 ft for the Catalina Yachts Catalina 30 MkII - Wing Keel Wing Keel 1986. That 1,3-foot difference affects which anchorages you can access, which haul-out facilities will take you, and how carefully you need to read the tide tables in shallower cruising grounds.
The Catalina Yachts Catalina 30 MkII - Wing Keel Wing Keel 1986 uses Sloop rigging.
Hull speed is rated at 6,9 knots for the Catalina Yachts Catalina 315 - Wing Keel Wing Keel 2012 and 6,7 knots for the Catalina Yachts Catalina 30 MkII - Wing Keel Wing Keel 1986.
Bottom line: The Catalina Yachts Catalina 30 MkII - Wing Keel Wing Keel 1986 and Catalina Yachts Catalina 315 - Wing Keel Wing Keel 2012 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.