Black - I like the Sicilian for 1.e4 and Grunfeld for 1.d4
White - Any Opening, It is black who's going to decide which opening to make.
Only partially, but there is no doubt black has a huge say in it.
You can't choose to play the King's Gambit if black responds 1...c5.
You also can't choose to play the Grunfeld or Sicilian if white opens with 1.b3.
Yah, not all the time. But most of chances it is Black who made a pick of opening. Especially if the opening move was common like 1.c4 1.d4 1.e4
1.b3 was a rare one.
I play Queen's pawn as white, and as black I do c5 for e4 or c4 and d5 for anything else.