Thanks everyone for your responses! I went into the store and tried on both sizes. Instantly fell in love with the mini size - it is adorable and can be dressed up or down, holds all of my essentials perfectly (card holder, keys, mini pochette, phone), crossbodies like a dream (the small size dug underneath my chest unfortunately). Both sizes are beautiful but I think the mini worked best for me. I have yet to take it out and about, but can post pictures when I do. In the meantime, here is a comparison of sizes per SA.
Thanks again everyone! I appreciate and value your input!