To what extent is the hadith "Whenever I was given the choice between two matters, I would choose the easier of the two" authentic? And does it include choosing the easier in reprehensible or forbidden matters according to Islamic law, such as taking commemorative photos, which is a matter of jurisprudential disagreement?

Aishah (may Allah be pleased with her) narrated that whenever the Prophet (peace and blessings of Allah be upon him) was given a choice between two matters, he would always choose the easier of the two, as long as it was not a sin. If it was a sin, he would be the farthest of people from it. This indicates that his choice of the easier option was conditional upon it not being a sin, and this also includes disliked matters (makrooh). This choice usually applies to worldly affairs and dealings, not to matters of worship and the rights of Allah. In matters of worship, the Prophet (peace and blessings of Allah be upon him) set the highest example in adhering to what is better, such as his standing in night prayer until his feet became swollen, out of gratitude to Allah, which demonstrates his diligence in worship and his piety. As for choosing the easier opinion among scholars when they differ, this is not permissible, because Islamic rulings are not to be taken based on whims; rather, one must follow the opinion that has stronger evidence, or consult people of knowledge and piety.