You didn't say how big the boat was so I will assume it is about 18 ft. That is generally the dividing line. As most have pointed out, the single axle takes less maintenance. The tandem can't be pushed around easily by hand. A tandem will ride a little smoother, but pull a little harder. If you get a flat on a tandem, you can keep going until you get to a safe place to pull over. (you can do that with a single too, but you may ruin the rim)
With all that said, I would stay with a single axle if possible.
Jerry
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