If you have multiple plants of each variety, and if you have enough space to plant more than one of each, why not do a trial? Cut back some, leave some as is. If possible, start some new seeds, so that by plantout time you'll have 3 versions of some varieties. It won't be a good test with only a few plants, but if you have plants to spare, it might be interesting to see if there are any differences.
That said, I'd be inclined to leave the seedlings.
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