As far i have test. both sound are fine. The front panel sound will depend on the quality of the cables. But most cases have good cables. I have test some cases myself. Asus app, sonic studio, if it works good for you, can separate the sound from the back from the front or have both sound with the same signal, is part of the option of the Audio Control. Since is your question is regarding the 3,5mm jack (front/back) i will leave that there. Since there is more. Overall since have independent amp on ROG audio, audio is the same quality and the front will depend on the quality of the front panel cables. Most do, but not all of them.