I think I'll go with a tie for FFVII and FFVIII (though I've yet to play V).
VII clearly has the most options and is probably the most creative, but this really only applies in finding better ways to take out the Weapons, you can kill everything else easily before you've developed your materia too the right extent.
VIII just rewards knowledge so much. Put a novice VIII player and an advanced player in front of the game for a few hours and the difference in their parties will be ridiculous. The hours spent developing characters that would even out players is almost completely removed.

So VII wins in full on power, VIII wins on speed and practicality.