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On a 13 the less weight on the transom the better. The E-Tec has a lot of nice features and it would be my intuitive choice. However, assuming the Yamaha is a four stroke and performance would be close if not equal it would probably be on my transom if the price is competitive.

Before making a final decision I would also compare the two engine's torque and HP curves. For a water sports use higher, earlier torque is important, especially if towing more than one skier and if more than three persons are aboard.

Finally, all the new engines are very high tech. I would not want an engine on my boat that was not supported by a competent and respected local dealer's service shop.