The Wave is a closed cell kite ; another advantage IMO for boat application is that it does not generate a lot of lift and limited power peak when crossing the window ; kite pull tension is very regular even in gusts and with less "violence" than a LEI or other foilkites ;
So all is depending on your financial situation IMO and aim; in order of personal choice, I would list the following :
1- LEI which you can find at all budgets possible, and they have an excellent advantage is begin able to be pumped on the boat , then laid on the water surface at 90 degree and drift away by the wind up to tension the lines and being launched directly from the boat ; the easier way to put the kite in the sky in the middle of nowhere IMO ; I did this twice starting from scratch with kite in the bag in the boat : very easy (you need to synchronise your pump stroke with the waves
to keep balanced) ; LEI are also good resistance to crash in the water ; LEI have better instant depower vs foilkites, which can be appreciated in gust or failed transitions ; LEI has no bridles that can be tangled , hoked on your boats floor accessories or damaged . LEI requires more rear line tension so maybe a bit more armful for your arms if you drive the kite manually during a long session of several hours. they need minimum 10 knot for a good flight and relaunch (this is the main drawback since foilkites could do lower like 7 knots if you are not expert
2- PL Arc (Venom, charger, ...) for its low budget as starter, great for its autozenith and resistance to crash and absence of numerous bridles lines (that can be appreciated when manipulated on a boat), in the range of 150/300 euro . Main drwwback : I do not know a technique to launch it from the boat directly but I think you can imagine one thanks to the autozenith feature ; also quite hard tension on rear lines for your arms ; PL arc need about8-9 knots to fly and relaunch technic is "particular:, also requires say 9 knots.
3- standandard closed cell kite (for low budget or second hand : pansh A15 for low budget, speed 3 or 4, HQ matrix), for higher budget I would have a preference for a CA wave if you have the money ; there are tecnics to launch from a boat in the water but it is more tricky and required a kite preparation that is doable on land, more difficult on a boat if you want to manage all from the boat only (like for successive sessions) ; low rear line tension, hence more comfort. need 7 knots to fly and relaunch.
4- Peak (limitied relaunch but easy unpacking and packing, robust during a crash), say about 400 Euro (v1 or 2 o 3 is suitable IMO ; launch from a boat maybe a challenge since it does not float well on the water ... medium line tension ; need 5 knots to fly but does not relaunch (some hopes above 10-12 knots maybe but not lower)
For all of them if you envisage to use the kite in 10-15 knots , I think you need some high power otherwise the boat will be glued to the water ; so 9-10 minimum; 15-17m max; About the lines, I think you do not need too much line length , something like 15 meters, which will improve your speed, upwind angle and comfort in gusts.