I prefer to use darkroom trays, such as for a running rinse I can set the tray so the water will run smoothly from the corner with the spout which helps keep the water and the prints moving. And they're the right size and depth.
I think it's better to not to get in the habit of using other household items for darkroom chemistry so someone doesn't accidently use them for another purpose (seems a safer precaution). I just find I'm in the habit of getting out the darkroom trays, Kodak squeegee and beakers etc. - I wouldn't want to absentmindedly grab a container for use in the kitchen and grab the wrong one that's had photo chemistry in it.