Rendering labels from Constants or Resource file

Hi All,
          I have a requirement to render the label on every form to display every label based on the logged in user. If user selected preference as Chinese, the form should be in Chinese otherwise it should be in default (en_US) .
          The entire form should not replace, only certain labels which are selected. So, my question is which will give the best performance replace label with constant or call every label from resource file?

OriginalPostID-270136