If you get what you want from S04 or US05 then go that way, I use both and they are easy to use and very consistent yeasts.
If you are looking for a specific flavour profile you can't get from one of the dry, culture up. In my experience (I keep a wheat beer yeast going), keeping a culture going and healthy can cause a few sleepless nights! If you are starting up, removing the yeast variable is probably a smart move...I'd go dry...careful on flocculation of US05, I find it a dusty mother...
Jeff Rosenmeier (Rosie)
Chairman of the Beer
Lovibonds Brewery Ltd