Braces, tooth extraction is required but which is better? (Photos)

Please I need your help, which teeth is better to extract on lower jaw left 1st incisor or right premolar (4th) tooth? my upper midline is to the right(right premolar extracted long ago) which will hopefully be corrected by narrowing left upper 4,5,6 teeth. On lower jaw left premolar is extracted and opinions are divided 50/50 over left 1st incisor and right 4th teeth/premolar to be extracted. Please give advice.

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