Here is the perfect article that explains the difference betweens Al Jazeera and Al Arabiya. It basically talks about how Qatar has used Aljazeerah to create media war against Saudi Arabia. They can't be in real war because they both in the GCC agreement which are they supposed to protect each others.
Alarabyia has been established in Dubai and ruled by Saudi Royal prince only to compete with Aljazeerah. This article talks more in depth about these issue
This is interview with the former adviser to the Saudi royal family, Jamal Khashoggi. According to him, Saudi Arabia military intervention in Yemen is to prevent the country from succumbing to a sectarian dictatorship.