I have the Electra Quick Release Wire basket which I like. I mostly use it to carry that extra stuff such as gloves, lunchbox, glasses and some groceries I may pick up on the way to the office. I like the basket because it can be taken off with just the press of a button. The mount is very sturdy. The basket bounces a little bit but not much.
For my laptop, my office clothes and shoes and some tools I use a pair of Ortlieb panniers.