Myself I use Unisol 4 brand sterile saline solution (sold for contact lenses.) Works fine.
If by "sodium chloride" you mean an isotonic aqueous solution of sodium chloride, then yes, that's fine.
An advantage of being bacteriostatic would be if concerned about introducing bacteria into the vial. If using proper procedure, keeping the vial in the refrigerator, and not planning to stretch the vial's use out for a prolonged period of time -- say not more than 2 weeks -- personally I don't worry about not being bacteriostatic.
But in an ideal world I suppose I'd add a little benzyl alcohol to the isotonic solution. I just haven't bothered.