I agree with Solus and DB on the single bent for the reasons they listed, but will add easier on the wrists.  I have some carpal tunnel and just last year moved from soloing with the J stroke to a hut style.  I can keep the boat just as straight with a 3-5 stroke per side/switch, all the effort goes into propelling the canoe vs. steering and mostly and the straight strokes have given my wrists a break from the extra stress the J adds when rolling them.  I now also paddle tandem and switch vs. J, just not switching as often, depending on the bow paddler, as I often out-paddle them on just one side.  That and a little vitamin-I allow me to sleep better nights.

pd