Black should exchange rooks after Re1 because you simplify the game while having a winning position. Every piece exchange generally favors the player that’s ahead.
After the exchange Black can play h6 to force 2 of white’s pawns onto the H file where they are no threat whatsoever because there is no way for white to guard the queening square, so black can simply plant their king there and indefinitely hold against 2 pawns while their rook bullies the bishop and the king.
Black should exchange rooks after Re1 because you simplify the game while having a winning position. Every piece exchange generally favors the player that’s ahead.
After the exchange Black can play h6 to force 2 of white’s pawns onto the H file where they are no threat whatsoever because there is no way for white to guard the queening square, so black can simply plant their king there and indefinitely hold against 2 pawns while their rook bullies the bishop and the king.