in High level turf war, you try and control certain areas that are worth the most while minimizing your losses elsewhere, and it does come off as pretty competitive. Splat Zones is just king of the hill, plain and simple. The modes would be played somewhat similarly at high levels, with a little more emphasis on a wider area in Turf war rather than all the efforts on 1-2 small areas and the chokes and flanks around them.
An option for ranked turf war wouldn't hurt, but I'm afraid of splitting the playerbase up too much with too many different choices, which could lead to longer wait times for games generally.