In my experience the H16 is a much more difficult boat to sail than the Nacra. The 16 pitchpoles, and flipsbackwards as well sometimes if you are not careful. The Nacra has a lot more hull volume so you don't have to be as careful about weight placement. This makes the boat a lot less work to sail. The Nacra tacks very easily, the 16 is a bear to tack.

The jib track wire can easily be taken off. If you are racing then you can sew loops in the tramp to attach the jib blocks. This is a very well known and well documented fix for the jib wire problem.

Personally I think that the Nacra rudder system is quite good. Very simple and easy to fix. No cams and springs to break or wear. The Nacra hull design is one of the best. They got it right the first time.