What is the ruling on reciting a surah after Al-Fatihah? And what is the ruling on a layperson choosing the fatwa that is most appealing to them?

Reciting a surah or what is easy of the Quran after Al-Fatiha in prayer is a Sunnah in Fajr (dawn prayer) and Jumu'ah (Friday prayer), and in the first two rak'ahs of all prayers. The proof for this is the action of the Prophet, may Allah bless him and grant him peace, as narrated in the hadith of Abu Qatadah. As for the third and fourth rak'ahs, it is preferable to limit oneself to Al-Fatiha therein.