I see no reason why a stockpot should be nonstick. I think the nonstick coating would wear quickly over time. Why nonstick a water pot?
My old pot is 20 qts. It's basically good for keeping things from running over when you have more than enough. If my ingredients are simmering and cooking in different pots, the grand finale is putting them together in the large pot. This would be soups, stews and pastas.
Keep the pot that you like best as to color and design. You describe them both as looking very nice. It's better to have some nice pieces of cookware than to have a bunch of odd ball pots and pans and an old 20 qt. pot.