Had to be said.
On topic: I mean, it depends on your comp. If you feel that you are constantly being fear locked out, than sure, go for it. Reverberating is the most all round as it works vs all comps. If the other comp do not have that much fears then the Impassive has no use. However if you feel like you are winning vs non-fear comps, than fine go for the Impassive one.
Best tip is just to try it out and see if you notice any big difference. Losing the Reverberating will ofc lower your burst damage output, but not by so much.