Creating High score using GUIText, '>' operation no working

All my game texts are GUIText and i'm trying to create a high score to display after each game ends. Every time i try to make an 'if' statement for when the score is higher than the highscore to change the highscore to that score, it either tells me you can't use '>' with GUIText or strings. here's the end of my script where this is occuring, let me know if you need to see more script:

 public void AddScore(int newScoreValue)
     {
         score += newScoreValue;
         UpdateScore();
     }
 
     void UpdateScore()
     {
         scoreText.text = "Score: " + score;
     }
 
     public void GameOver()
     {
         gameOverText.text = "Game Over!";
         gameOver = true;
         highscoreText.text = scoreText.text;
 
         if (scoreText > highscoreText) //this is where the problem is but there may be more issues
         {
             highscoreText.text = scoreText.text;
         }
 
     }