A mix of stuff, really. It all depends on how light we want to go.
I have a Snowpeak Ti gas stove for overnighters and lightweight stuff with a set of Snowpeak mithril pots to go with it - they really are lovely. I also have a Clikstand and Tatonka meths burner, with an REI Ti pot which is what we took to the USA in '08.
Julian now has a full-sized Trangia setup for heavier duty trips and when we're on the tandem with a trailer, we take that. If we're doing the gourmet cooking thing, we have been known to take two cookers - it's really handy to do rice on one and sauce/sausages on the other.
My White Box stove is reserved for ultralighting and the Zombocalypse. It's a marvellous bit of kit, but it's for heating water on, not doing cooking.