User blog comment:Omega natsu2/Chapter 388: Erza vs. Minerva, Predictions./@comment-7418318-20140609075616/@comment-7418318-20140612212842

But Arba served Solomon for her entire life. She was literally created for the sole purpose of serving Solomon and even stayed at his side when he switches sides away from her very creators.

I think the magnitude of their betrayal would be equal for the two of them. Though with Solomon's trust in Arba already being shaken and Sheba carrying his child, Sheba being the betrayer would probably hit him worse at this point.

At least we can like rule our Falan aru. :P