Both are excellent manufacturers. And various models have various strengths and weaknesses. Your task is to choose the model that achieves the best-possible compromises in the price point you're looking at.
I just recommended to my friend to buy Hitachi or Toshiba as the Toshiba's we looked at did not have auto convergence nor did they accept 720p. I also really like the picture quality of the Hitachi's.
I have had Hitachi computer monitors for years, even refurbished ones and they are all excellent and quality monitors.