Liquidating to a pawn ending

In endgames an especially difficult decision always needs to be taken at the point when there is the opportunity to aim for a simplified position by a further exchange of pieces. This was the case for White in this position, namely whether he had a better chance of achieving a draw in the pawn ending after 52.Rxh3 or in the rook ending after 52.Ra1 Rxh5 53.Ra8. How would you evaluate the two endings and which choice would you have made?