I used Sporty’s to study for my PPL written before I even started flight school. I thought it was ok, I mean I passed, so…. FFWD to starting flight school and having to do the King’s School curriculum for ground and I can now say definitively that I much prefer Sporty’s. The quality and modern feel of the videos make them more engaging. Better UI as well with Sporty’s. I used them to pass my Instrument written (IRA and FII) and now studying for commercial. I still have to do the King School ground to satisfy my flight school but I’ll continue on with Sporty’s on my own.