Network SImulator with large user base

For me to choose a network simulator, one of the factor is to use a network simulator that used by a lot of user. Here why :

1. More popular the network simulators. Me myself would prefer a network simulator with a lot of user using it compared to simulator with only one user using it.

2. Build confidence in the result . The more user using it, the more validation work can be done. Validation work build confidence in network simulators.

3. Easy support. By joining their mailing list we can easily get support from the user. There are a lot of people discussing about the network simulators.