It doesn't care that I've got a really good job, or that it's relevant to the courses I took. Or that I even finished my degree. It's just the same in that respect.
Holberton takes a higher percentage, but earlier on and only for three years. When you're earning less. You might thing 17% is shitty but coming from low or no income, you're probably not going to notice it. Three years will fly by and by the fourth, you get a massive pay jump.
I prefer Holberton's take to my up-to-48y lien.