Overall both will do you well as far as learning the basics of foiling without too much hassle. The hard part is where you say:
That is so dependant on how good a kiteboarder you currently are, how quickly you pick up new sports and how often you get out foiling and thus improve. Also, there isn't really one foil that will allow you to cover all types of kite foiling disciples and only once you get into it will you really see the style of ride you will prefer.I cannot afford to buy a set up that I will grow out of in a season or two.
Back to the actual foils - you are right to pick foils like the DA or AA/HF4 as you will find learning far easier and progress past the more frustrating early stage,s way easier - too many people get a more advanced foil to start with, to save themselves a second purchase down the line but then struggle to just get the basic dialled. Both they foils will be good for learning the basics of foiling back and forward and gybing.
The DA's downside is that it is a bit slow - can feel like a bit draggy once you're more experienced or have ridden other foils (though if this is the only foil you have access to you won't know any difference and be happy with it
). Also because the front wing design is quite dated - it's the original "shovel" design, it has quite a narrow span (the width from tip to tip) and so when you come to learn things like foot changes it can be a little bit rolly and harder (or a better way to put it would be, its a lot easier to learn on some other newer front wings). The final issue with the DA is that you can't change the front wings, the 2019 Cabrinha foils use a different fuselage so there is no way to just upgrade part of the foil. But these negatives aside the DA is hugely popular with beginner foilers, I know several people who have/had them and all have progressed really with on them. Because of that resell value is very good too, so if you want to upgrade in the future, you can easily pass it on. I'm also a big fan of this style of the low volume ABS style foilboard for beginners - many find it way easier to move the board around and get it on their feet compared to the volume style boards.The AA/H4 - I only used this briefly so my experience with it is limited but I did like it and found it very quick to adapt too and for quite a large front wing it was surprisingly easy to ride (lift was slow and predictable, and not too front foot heavy which can be harder for new foilers to get to grips with). I'd agree with @Kamikuza that it's not the lightest of foils and you might outgrow the front wing, depending on how you progress through the larger wing and its wider span does make it more roll stable which helps when learning some techniques. One advantage with the Slingshot system is you could just buy a new front wing and that would then give you a whole new ride for a relatively small additional cost.
At the end of the day, you'll be happy with either and probably whatever you can get at the best price and quickly will be the winner. Just get started!
One quick tip - you said the wind in your area is 8-13 knots - though foiling in 8 knots is definitely possible, its hard work when you're first learning, realistically 10 knots is probably the minimum and we normally recommend 12-18 knots as the best wind window if you want to make life as easy as possible for your first attempts. By all means try in those lighter winds but don't be put off if you struggle and realise its probably the conditions rather than you that is making it hard.
