Age 43, crooked teeth on lower jaw & slightly forward on upper, straightening or zirconia crown?

I have crooked teeth on the lower jaw & my upper jaw very mild ie my front two tooth slightly are forward. I have been advised by my orthodontist that to achieve a white straight smile I would need to wear fixed braces up to 14 months. I’m not keen as it will take 6 months on my upper teeth but I will need to keep them on. I also want to get a white smile, which I won’t be able to achieve after this period. I want some advice on best options. I’m 43 and costs are more with straightening.