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You have more confidence in it than I have. After all, they are sort of the Holy Grail of organ playing. Now which one shall I try? Is there an easy one? Don't think so. The most beautiful one? Hm, that's all 6 of them... Even choosing which one is difficult... :-)

I want to learn the E minor.

Ah, the one with the fast paced triplets in the third part. Very tricky. And food for debate: are the dotted rythms to be played in the rythm of the triplets or as true dotted sixteenth with a 32th following?