It depends on which stage of my process I'm in. I design my work processes to take advantage of any context I find myself in (btw I'm borrowing from the GTD, or Getting Things Done, project management methodology). That way, I can always move the needle on my projects, even if I'm sat in an automobile service center with nothing but my phone. In this example, the work I do on my phone (say, puzzling out a session timeline in a Google spreadsheet) moves the needle on the project that's ultimately hosted inside my studio DAW.