I just got back from ten days in Los Barilles with nine days of great wind. In past years I have also had several trips to La Ventana. Both are comparable in wind (both had 9 out of 10 days of wind during my trip). The water conditions are comparable in both locations and both have good kite schools.
I know that in Los Barilles Dante does a great jobhttp://www.kiteboardingbajaschool.com/
and in La Ventana Marie has a good schoolwww.elevationkiteboarding.com
Los Barilles is a bigger town with things like a supermarket, shops, and a much better selection of restaraunts. Your wife will find more to do in Los Barilles. I went with a group and we found it easier to rent a house centrally located in Los Barilles. In La Ventana many of the house rentals are not near the central area and so then you will need a rental car.
You will enjoy either place.