As you can see there is no correct answer other than what works for you. I personally use one of the cube shaped coolers not sure of the #qts. I mainly use it because it is taller, easier to reach from my chair on the front deck, dont have to leave my chair, and it takes up less floor space. But the correct answer is what ever works best for your setup.
That's the one I use for my drinks. Perfect size for me. Other one required too much ice. My fish just go in the livewell. Summertime, I try to get out early, and home by noon. It keeps me not too sunburned and the wife not too pissed, so I can do it the next weekend.