As discussed above, how a tequila is best consumed depends upon how it has been produced.
Generally speaking, blanco or reposado tequilas are usually best served in popular cocktails, such as the Pina Colada, Margarita, or Paloma, whilst añejo tequilas are often best consumed neat or in a shot, due to the added complexity of flavour.
Whilst blanco tequilas are commonly used as cocktail bases, it is possible to find very premium bottles of blanco tequila that are made to be drank neat.
It's also important to note that some tequilas gain their golden or aged look from artificial means, through the distiller adding colourings prior to bottling, meaning it's not always a guarantee of quality to look for gold coloured tequilas.
Ultimately, one of the best methods of finding out whether the bottle of blanco, reposado, or añejo tequila in front of you is worth consuming neat or mixed, look to see whether it is 100% agave or a mixtos tequila, as those made exclusively using blue agave overwhelmingly tend to be of a higher quality.
It is also important to look for well aged bottles of añejo or extra añejo when trying to find those tequilas that are more complex in their taste and character.