I decided to stay in 10C; it was tolerable leg-room wise and I flipped up the aisle armrest at times so I could stretch out a bit. I might try 21C/D in the future, but it was nice that when beverage service started, the aft end of the cart was by me so service started at my tow.

The only main gripes were the lack of cushioning on the seat pan and non-existent airflow, as noted
in this thread: 737 MAX 8