If I had to choose one, it would be lemon.
I don't like lime in my beer, Mexican or otherwise, but I do like lemon in iced tea, squeezed on fish, veal, and of course when making LEMONade!
Now, when it comes to a cocktail, like a Vodka or Gin and tonic, no question, for me,lime is king. But, a lemon can and does work as a substitute.