Skegs vs Rudders - which and when

The classic expedition kayak question. What each system does, when each helps, and the British vs North American traditions behind the divide.
The function of each
Both systems are about controlling weathercocking - the kayak's tendency to turn into the wind. A skeg is a retractable fin under the stern that varies depth via a slider. A rudder is a steerable fin operated by foot pedals.
Skegs - the British tradition
Skegs are the European expedition standard. Adjustable amounts of skeg deployment let you fine-tune the kayak's neutral wind heading. The cockpit stays uncluttered; the paddler steers with edging and stroke choice. Lower mechanical complexity, fewer parts to fail, smaller mechanical footprint.
Rudders - the North American tradition
Rudders are dominant in North America, Australia and New Zealand. Active steering reduces paddler workload over very long distances. Down-wind running is easier with a rudder. Foot pedals must be properly tuned - poor pedal setup causes back pain on long trips.
Expedition trade-offs
For high-mileage open-coast expeditions (1,000+ miles), most paddlers prefer rudders for the energy saving. For technical coastal work in tide races, rock gardens, and surf, skegs are the more responsive choice. Many of the longest expeditions in history (Caffyn's Australia, Alaska, Japan) used ruddered kayaks; many of the most technical (UK circumnavigations) used skegged kayaks.
Practical recommendation
First serious expedition kayak: skeg, learn proper edging-and-stroke steering. Second kayak when you start covering serious miles: ruddered for the long-distance comfort. Most serious expedition paddlers eventually own both styles.
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