best way to steer a small line following robot?

i am trying to decide the best way to steer my line followimng robot, would i be better using 3 wheels with the single wheel being turned a servo and the back two wheels just being the drive wheels or using the rear wheels to stear by altering the speed of each wheel?? how do you seer your robot?
thank you lg

Generally (at least with a Lego[SUP]TM[/SUP] rig), I've used two independently driven front wheels with a free-wheeling single rear wheel. Tends to give the best control and the tightest turning radius.

thank you for that did you use encoders?

cowboybob said:

Generally (at least with a Lego[SUP]TM[/SUP] rig), I've used two independently driven front wheels with a free-wheeling single rear wheel. Tends to give the best control and the tightest turning radius.

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I agree with that. I built one a while ago that worked the same way. No need for encoders