Queen and pawn are normally equilavent to two Rooks. This means that Q+P VS two Rooks is drawn, but Q+2 Pawns VS 2 Rooks is won, while with even Pawns or one Pawn to the good, the 2 Rooks will win. Without Pawns the game as a rule is drawn.  If the enemy King is confined to the edge of the board, the Rooks may win; if the rooks are not adequately defended the Queen may win.

The Queen is nice cuz of mobility but 2 Rooks is easier to checkmate.  Nusons and Reshevskys_Revenge is right.

if I have connected pawn chain then 2 rooks, if enemy have isolated pawns then a queen. if i have isolated pawns and he has a pawn chain then still 2 rooks but if we both have isolated pawns then queen. thats like in general.

It would depend on the position.