It depends really. From behind the baseline (returning deep lob) I want to drive it with margin over net, tons of pace and good RPM to secure the ball getting down before court ends. So, if enough time, I'll prepare high (even higher to compensate for bending legs), let it drop just below the contact point and rip it through and accross.
From inside the baseline, hitting a sitter, I'd visualise hitting almost downwards into the court. I'd possibly prepare level with the ball and hit through with decent (though not extreme) effort and some natural topspin.