Would it be more beneficial to prioritize completing my missed Qadha prayers over performing Salat al-Layl, considering that I currently make up for them by praying one Qadha Fajr Salah and another Qadha Salah daily?
The reward of performing Qadha Prayer is greater than performing recommended prayers. No doubt, performing both is much better, but if you have no other option but perform either Qadha or recommended prayer,b then Qadha is first because it is obligatory.
Wassalam.