Turning; easier one way or the other?

[FizMan]

Working on a possible design for next year, I was just curious aboot which way is easier to steer:


1) The wheels on the 24" sides
2) The wheels on the 30" sides

This is with tank steering, so one set runs backwards, the other goes forwards.

My logic tells me that having the wheels 30" apart (instead of 24") means that they'll produce a greater turning force (torque) around the axis of rotation (the centre of the bot). So I just want a bit of confirmation on that.