A recessed oval medicine cabinet has several important upsides:
The bathroom appears larger
Medicine cabinet that is recessed has a subtler profile than a wall-mounted one
Hinges on the medicine cabinet are hidden by the mirror of the recessed frame to give a more attractive look
Oval shape complements an item such as a pedestal sink because the mirror has negative space at the corners and the sink as well has negative space around the pedestal base. Another reason a mirror of this shape goes well with a pedestal sink is that both have curved lines.