Still, most Guns reload quite fast, so Rapid Reload is barely worth a damn except for weapons with absurd reload times.
Matter of opinion, or rather, your character preference.
I personally consider it a sin to go WITHOUT rapid reload, but then again I tend to stick with cowboy weaponry.
Lucky and the Medicine Stick, if you build a character towards them, can be absolutely devistating, but both definitely require Rapid Reload, cause otherwise you're not gonna have
TIME to reload.
So yeah, to be honest I don't think we can even answer OP properly. OP, I guess take Black Widow for now and if you find yourself enjoying revolvers and lever-action rifles later, pick Rapid Reload up too.