I have already stated it's your personal choice.... but your logic of Iran being a liar makes Saudi a liar is not so convincing and require some ground.
Saudi Arabia is not a closed state like Iran, neither it's banana, not all of the reports coming from Saudi issued by state. Every one report as they witness.
https://www.arabnews.com/node/1499756/saudi-arabia
link to the video was provided on pdf many times at the time of incidence, i posted earlier in my previous posts and now here again few video links on internet:
Americans have confirmed that missiles fired on KSA are of Iranian origin. Saudi report was never declared wrong, debris were displayed to international audience:
Independent analysis on missiles fired upon Iran:
https://maps.southfront.org/missiles-and-drones-a-close-look-at-houthis-new-weapons/
Attacks on Mecca were repeated attempts; record starting from 2016:
https://www.spa.gov.sa/viewstory.php?lang=en&newsid=154686
Than in July 2017 and last time in 2019:
http://saudigazette.com.sa/article/566760
Argument:
Shia of Yemen, have no known missile and drone development program, although Iran has repeatedly denied those were Iranian missiles.
Even Iran it self use Ukrainian, Russian, North Koreans, Europeans and Pakistanis for missile /drone technology transfer.
Every world media reported it, if it was fake they would have raised questions. Iran would have dragged Saudis in litigation, there would have a never ending propaganda campaign against Saudis on pdf.
Rest
@Khafee can add.