weapons question

Hi gang! 
I was wondering. If one weapon has a damage rating of "Moderate to heavy", meanwhile another weapon has the same damage rating (moderate to heavy) - BUT - that second weapon requires higher stats - which weapon is better?
More specifically, the null rifle is 0/0 with moderate to heavy damage. BUT there are other weapons we can buy with the same damage range - BUT require higher stats. Does that mean the null rifle is not as useful at the other weapons that require higher stats?

I was wondering. If one weapon has a damage rating of "Moderate to heavy", meanwhile another weapon has the same damage rating (moderate to heavy) - BUT - that second weapon requires higher stats - which weapon is better?
More specifically, the null rifle is 0/0 with moderate to heavy damage. BUT there are other weapons we can buy with the same damage range - BUT require higher stats. Does that mean the null rifle is not as useful at the other weapons that require higher stats?