You will have ample circulation either way. Some times i shut BOTH mine off for several hours at a time as running either (even at low) kinda ****es off things like frog spawn and torch corals. Its nice to have too much power rather than not enough however. Your skimmer and main pump should provide more than enough oxygenation and filtration so the primary purpose of pumps like this is to move nutrients around for consumption and export. If you are going to be controlling these manually or with a controller, remeber it is perfectly find to turn them off at times to let everything chill, then you can turn them back on at various combinations to stir the nutrients around for consumption. I have the luxury of being home LOTS (working from home huge chunks of the year) and im finding that having them both shut off for a few hours a day is beneficial to some of the more flow sensitive corals.
So you have lots off options 1)"off time" 2) WP 40 time. 3) WP 25 time 4)Differnt power levels (they each have a low, medium and high for wave mode and a simulated "random mode" and 5)Both on full power time.
Vary your flow by utilizing ALL possibilties throughout the day.