Washer on the left, dryer on the right the past 5 years since we got our front loaders. That is not how we wanted them. But the installer pointed out that front load washers, at least our LG, have the door on the WASHER hinged on the left side, and the door on the DRYER hinged on the right side and they are designed to be placed this way so you can move the washing to the dryer without having the door in the way.
Our dryer vent is on the left side, so I had to get a longer vent tube when we put the dryer on the right side.