I've used and sold LEI and foil kites for nearly 20 years. Each has their place and the characteristics of each will have appeal to different people in different conditions on different equipment. But don't use magazines for info on foil kites or contemporary kitesurfing/foiling, by the time they're on the shelf they're out of date. Use the Internet and forums like this. There are quite a few forums worldwide, and with google translating your web pages you can read a German forum on foil kites as easily as this site.
And Youtube has a truckload of videos on foil kites, you could spend days watching them learning everything from how to launch and land to how to jump over small islands!
So now you're using the Internet, find someone who uses or sells foil kites close to you and ask to try them out. Make sure it's a foil kite suited to what you want to achieve, given you're wanting to hydrofoil and try waves with a foil kite, something like a Flysurfer Soul or maybe an Ozone Hyperlink may suit. You don't want a full on race foil kite. Also try the correct size for what you need so you're not over or underpowered.
Bear in mind some of the best foil kites ever made have just come out over the last year. They are designed to be versatile and user friendly. And sometimes you have to just spend the money and commit to buying one after doing your research. Sometimes that's the only way to find out what's right for you. And put the time in to learning to fly and use a foil kite. It is different to an LEI kite and it will feel strange until you get used to the way it works and then you'll understand why some people rave about foil kites and others don't.
I use both types of kite for foiling and now have a Flysurfer Peak4 single skin foil kite. The Peak4 is different again and also lots of fun.
Now you've written your post and so far have 3 pages of replies, read them, take action and keep posting on your experiences. Don't succumb to analysis paralysis, just do it