New Photonia hedge planting advice please

I am going to replace my deciduous hedge with an evergreen photonia red robin hedge so looking for some planting advice. It will be an L shape 5x2 metres behind a low wall, as pic below. Ultimately I would like it to grow to around 2-2.5 metres at which height I would keep it trimmed.
I’m unsure whether I should buy pot or root ball , I’ve been told root ball is more bushier and so i would require fewer and the hedge would give me privacy quicker but on the other hand the pot plants have been better nourished but will be hardier, also as they are thinner would it take longer for the hedge to fill out ?
Im also unsure as to how many I would need per metre, I’ve been told 2 by one seller and just the one by another.

I’m unsure whether I should buy pot or root ball , I’ve been told root ball is more bushier and so i would require fewer and the hedge would give me privacy quicker but on the other hand the pot plants have been better nourished but will be hardier, also as they are thinner would it take longer for the hedge to fill out ?
Im also unsure as to how many I would need per metre, I’ve been told 2 by one seller and just the one by another.

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I cannot comment on which is best, but best check with them on how they are currently growing. Many shrubs like Photinias don't cope that well with extreme cold, and that means suppliers may sometimes grow them in warm conditions especially over the winter month to make them look more healthier, but this is not always ideal as once it's planted out in your front garden, it may be cut back by cold weather and wind.