It was Hippolyte pre-Crisis, but then again...it was a whole different character pre-Crisis (For one thing, homegirl was blonde).
Diana would win. Her superpowers are all natural, whereas Hippolyta needs special tools to be superpowered. In fact, Hippolyta's "powers" are literally and fittingly at pre-Crisis Wonder Woman levels; no earth-shatteringly cosmic feats, just lifting tanks and stuff like that. Let's put it this way; there's no way she'd be able to go against Superman where Diana could.