Stability, because few paddlers want to end up capsized, is very important when choosing a kayak.
Chine is another element of hull shape that assists with turning.
Rocker is part of what makes a kayak go where you want.
One thing all Necky touring kayaks have in common is the "Dolphin" bow, which features smoothly flowing rake, generous flare, and buoyancy.
"How fast will this kayak go?" It's a common question, especially among paddlers who want to travel as efficiently as possible.