Yes, the bigger the pond, the easier it is to take care of. A 3,000 gallon pond is less maintennce than a 1,000 gallon one. A 5,000 gallon one is less maintenance than a 3,000 gallon one and so on.
The larger the body of water, the slower the changes take place within the water so water quality is easier to keep stabilized.
You didn't mention how deep your pond will be, just the width and length. I will tell you that it will be hard for you to catch fish in an 11 foot wide pond without physically standing in the water with your net. My new pond is going to be 20feet long, 8.5 feet wide and 4 feet deep. Go deeper rather than wider to get the volume.
21x26 will be a nightmare to catch fish in. And you need to be ready to do that do look at fish who may have an ailment or what have you. That's a swimming pool, not a pond. LOL! is your pond going to be above ground, under ground, half-n-half?
Is it going to rectangular or freeform?
Go long, but don't go too wide. Instead of wide, go deeper. Your net will go down, it will not go across that far without you standing in the pond--and still it will be hard to catch fish in a situation that wide. For example, I am going to build a sieve net on a frame that stretches across the 8.5 feet, so I can corral the fish into a smaller corner to catch whomever I need to. How can you do that in a 21 foot pond??