My daughter has a 10mm overjet, 5mm overbite and a narrow upper arch. Last year she was told she needed braces for 3 months to straighten her teeth for a twin block appliance which she would wear for 9 months, however, she never wore it. We went to see a private orthodontist who assessed her and said she could either have invisalign and elastics for 2 years, or damon braces and elastics for 18 months. Which one would be better for her?