For children with myopia, which is a better line of treatment, under-correction glasses or peripheral vision management?

Hello doctor,

I have a five year old daughter who will be attending kindergarten this year. I have taken her to two different optometrists, who have indicated that she has myopia (both eyes are around -3 dioptres to -3.5 dioptres). My daughter has been reading books for hours everyday day since she was three years old, which I understand is a likely cause of myopia. My issue is that the two optometrists have suggested different prescription glasses. One has suggested fully corrective lenses (at -3.0 dioptres OS and -3.25 dioptres OD) and the idea of using special 'peripheral vision management' lenses. The other doctor has suggested that a weaker prescription (-1.5 dioptres on both sides) would be better as it would force her eyes to try harder to see, and they would be more likely to adjust themselves in the right direction. He has also recommended a bifocal lens, with +1.25 dioptres when she looks down to read. I am not sure which doctor to believe.

Kindly advise.