It mainly depends on your budget. Netting backstops are used by most larger organizations, because they are more forgiving & absorb impact better than chain-link. However, netting backstops require more maintenance & can be more expensive over a period of time. On the other hand, it's easier to get larger coverage with netting backstops, since netting is cheaper per square foot than chain-link. Portable backstops work great for batting practice & temporary applications, and can be moved & set-up in a short period of time.