I don't currently buy two pairs but considered it as I don't think it is good for my feet to wear a shoe too big on my right foot.
I can only wear flat or very low heels and if boots they have to have with full zips - due to having dodgy ankles. All my toes have been straightened and my feet are 'sensitive' so comfort is important to me.
I thought it might be worth a try to see if there is a shoe buddy for me out there somewhere :) who I could liaise with. I uploaded a picture of the last 4 pairs I got for my Holiday next week as a guide to my taste.