Cloning: choose healthiest or first rooted?

I've got a good situation: more rooted clones than I need for my next crop. My question is do I use the ones that rooted first or the greenest healthiest looking ones?

I think the answer is to go with the healthiest ones, but I clone from clones (after a month of veg, right before putting them in 12/12) so I don't want to select for slow rooting.

There's a difference of over a week between the first and last rooted cuttings.
 
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