Excellent round-up & great explanation of some of the tech differences there Darren.
The statement "There is no such thing as the one single kite being perfect for everyone in all conditions" is it in a nutshell.
(not taking away from any of the explanation of what works, where & why).
Fact is kite cos can, and do, put out any style of kite as their own option of what they consider best as a "Wave Kite".
But it all comes back to kiters preference, riding style & conditions.
What one kiter considers the 'best' wave kite on the market will be another kiters 'worst possible' option.
One of the basic characteristics in this choice is the speed of the kite. For some the faster the better will be the goal - for others a slower kite requiring less rider attention will be the Go-To option.
From the range of discussions you have in a shop - with all sorts of kiters - my summary is this:
Those guys who use their kite pretty much constantly - powering their ride, positioning & repositioning on the wave etc tend to lock into those models which are designed around fast turning speed.
Those who are more of your 'paddle-in' style purist "surfers" who are more into using the kite to get onto the wave but then want the park & ride experience of just you, your board & the wave then the more stable, slower turning 'set & forget' type of kite is where they find what is right for them.
A BIG generalisation here but it may help you consider which range of kites to consider if you consider first where you fit in this picture.
Two absolute essentials of kites claiming to fit into the "Wave Kite" class are:
1) constant power - not necessarily lots of or little of but consistent &
2) stability - especially from backstalling generally but also having the ability to recover from slack lines.
Any kite that doesnt rate on these 2 scores doesnt rate as a "Wave Kite" - imho.
The BEST option is to have one of everything & know what you want every different day