Pick the bigger pot or pan.
Nothing more frustrating than having a clean stove top and watching your pot of boiling potatoes boil up and over the side of the pot. Scrubbing burnt potato foam off your burners is no fun!
With a pot not only do you risk the very probable possibility that whatever you’re cooking will spill over, but you may also spoil your dish. With less liquid in the pot, burning can happen more rapidly.
With a pan if you are cooking ground beef, for example, it will be overcrowded in a small pan and will not cook evenly and will end up boiling rather than searing or sautéing. Yuck.
Even if you think that you may be able to fit it into the smaller one, do yourself a favor…grab the bigger one.