I’m not sure it matters (BWF) - interleaved AIFFs seem to open just as well in my world (Logic, soundBlade, DVD Studio Pro etc). sB and PT split them up nicely, while Logic keeps them packed in a lane. I do like BWF’s rich tags and rational time references though, and wouldn’t mind seeing them as a “standard”. Lack of proper multichannel support locks WL7 out as a main axe over here… it’s mentally draining to hop around between daws for me and we do surround authoring (YMMV).