The technique to ask your colourist for all depends on the final look your after. Balayage tends to have a natural effect, with the hair gradually lightening down the strand. Highlights have a tendency to appear chunkier, or more strategically applied, and typically requires more frequent touch-ups.
If you don't see your colourist often and want to lighten your hair but be able to grow it out without it being too noticeable, balayage is the technique for you. Alternatively, according to Elizabeth, if you want to colour your hair several shades lighter than your natural colour "and/or want a high contrast hair colour," foils will work best.
If you're still stuck, your best bet is to find a stylist you can trust and listen to their suggestions. "As someone who has done many colour corrections, a good colourist is worth investing in," Rubenstein said. "I always listen closely to what the client wants, but to avoid getting anything lost in translation, you and your colourist should look at some photos together. Find photos of people who look like they have a similar base colour and texture as you."
She continued, "The final step is to listen to the professional. They should guide you in the right direction based on what will look best while also keeping your hair in great condition."