um, Ares
was a wuss...fierce though he was, if he ever got injured, he literally went crying back to mommy Hera on Mount Olympus. But aside from that,
he'd probably just skin you alive, make you watch as he added your flayed hide to his bed of people-skin, and then decapitate you (and maybe save your head to play kickball with later).
Aphrodite, though, had an affinity for putting curses on people; turning you into stuff, effing up your sexuality (the women of the Island of Lesbos became the first "LESBIANS" for failing to sacrifice to her, Pasiphae fell madly in love with, and screwed, a bull, to make the Minotaur, also for failing to make a sacrifice), and then basically laughing at you when your life went all to crap.
So...
Ares gets points for the most
brutal torture, but Aphrodite wins for the longest
duration (I mean, heck, you'd probably at least pass out when you got skinned alive by Ares, but Aphrodite would make sure you were awake for the entire duration of whatever humiliating torture she inflicted on you...)
“…Judge not what a man has done, but judge what he could have done if he was a different bloke altogether. For art thou a leper? And a leper can changeth his spots…” --Rudy Wade, Misfits (Series 4, Episode 8)