If I need wheels at all, I would take a spinner. I can walk full speed and weave through a crowd with relative ease.

I tend to fly into huge airports with long corridors and so the spinner helps me beat the rush pretty often.

I used to feel two wheels were more controllable until a pilot ran me over with a 2 wheel carryon because he misjudged the space available and passed too close to me (I was already walking along the wall of the corridor with no room to give or retreat). That's when I started walking with the spinner directly in front of me, so any space I fit will be sure to accommodate the spinner too.