Tried Oracle out for a bit on H BRF (Thogar/Maiden) and made a few attempts on N Blackhand. Without giving logs up, I found that using Leaves averages about 30k HPS, while on the other hand, Oracle kept me anywhere around 23k-25k HPS. Leaves did leave me OOM toward the end of the fights, alternatively, with Oracle I came no where close to being low on mana.
Overall, I can't decide between Leaves and Oracle. I'm going to keep tweaking Oracle to see if I can get it to work better (I was using dlr setting on the setting manager for Oracle).
For the out of the box kind of thing, Leaves wins hands down, easy to set up and for the most part, pretty efficient. My only gripe is I like to use the mana pot that immobilizes you for 10 seconds and Leaves tends to kick me out of that, wasting the pot.
I feel that if you were willing to put the extra work toward perfecting Oracle however, that you would find better results.
EDIT: I found that Leaves uses Wild Mushrooms a tad bit better than Oracle did. With Oracle, it felt a little random where it was placed. This can easily be fixed by just putting it down yourself.
EDIT2: I also found that Oracle tends to be more reactive when using Displacer Beast manually, namely being that there was no 'delay' from the start of manually pressing Displacer Beast and the bot taking over.