I didn't use any table on either of our two S&G boats. They were primarily constructed on saw horses. The initial glue up for the longer panels and the deck stringers was done on a scrap section of plywood mounted to a strong back.

Your joint selection will be based on location on the boat. I would generally avoid a finger joint, especially if the joint will be hidden. A scarf joint for the stringer makes a lot of sense because it is easy to make correctly, requires no special tools and is quite strong. A finger joint, unless it is very precisely done, will leave gaps and the joint is only as strong as the individual fingers. On the deck, a reinforced butt joint works very well. The bottom and side panels are generally scarfed.

I can recommend "The Zen of Wooden Kayak Building", from CLC Boats. It is a great video with excellent instructions for this type of boat and it is very reasonably priced.

Hope this helps.