From my uneducated perspective but having watched both boats sail in real life on the same water that I often also sail on, I agree with Weta's consensus.
I also watched Te Aihe sail two practice races on the inner harbour course a couple of weeks ago (and posted a short vid of a mark rounding and subseqent gybe here) and they didnt have any control issues that you mention above, looked to have good tacking and gybing angles when compared to Defiant and got round the course with dry laps.
I have no idea whether that means one boat is faster than the other, and they will both be testing all manner of hardware, foils and systems, some will work, some won't = control issues when they try them.
I hope the racing is super close so can't be labelled a fan boi of any one team, and I think the arm chair admirals here need to give more weight to the perspectives and insights of what those who have actually watched these boats sail have to say.
Cant wait for all the teams to turn up!