NarnianGarden,
I'm not sure about Kennebec. This is my first time growing them. What I have read about them is that they are used to make potato chips and frozen French fries.
Red LaSoda (also called Red La Soda) This link is informative
http://potatoassociation.org/industr...anum-tuberosum
Every potato gardener I know around where we live in Texas grows them.
They are perennial - if you leave a potato in ground - there will be a new plant next year. They store well for months. We plant from cuttings. The cuttings do not have to have eyes on them to produce a plant and potatoes. I have never saved potato seeds because of the ease of planting cuttings.