I am doing Grade 8 ABRSM next June and i am still confused between what piece to choose from list B. I am confused between the Mozart K.330 in C and the Beethoven Op.90 in E minor.

Note that here i am not choosing on the basis of which is more difficult. I want to choose the one that will be a good addition to my repertoire. That, is i plan of not learning the first movement only for the exam. I am planning to learn the whole thing. So, it is a question of which sonata is more beneficial as an addition to my repertoire.

My repertoire already includes a Mozart sonata and a Beethoven sonata. The K.545 and the Pathetique ( all 3 movements ). So, do u think i should learn a harder Mozart sonata (K.330) or another Beethoven sonata so that my repertoire includes 2 beethoven sonatas ??