For me it all depends greatly on the genre of music i am playing. For house, trance and some of the slower acid and/or techno i like to use the channels predominantly as i find it nicer for long, smooth mixes. For some of the faster stuff (145bpm+) ie hard techno/acid, gabber, dnb and even the oldskool hardcore (not happy) i use crossfader a lot as i love to chop my breakbeats and faster music up while still using the channels to fade out etc. If i’m using a 3rd channel. Say, for my 303 or whatever other source i have going through it at the time i’ll tend to use the channels more than crossfader. At the moment my crossfader is slightly butchered so i am doing most stuff with switches or channels or both at present