How did the roots look when you planted the sample? How often have you been watering? Is the soil poorly drained and/or heavy clay? Newly planted plants can wilt from too little or too much water. We rarely see Verticillium wilt in DE, and it's more likely this is a root problem. I would suggest gently pulling or digging the plant up and checking out the roots. If you'd like to submit a sample to our diagnostic lab (it's free), see instructions here: http://www.udel.edu/extension/plantclinic. I would suggest submitting root and stem samples. 

Depending on how wet the soils are, and how much rain we've gotten, that may be too much water for them. It's possible the one plant came in poorer shape than the other. We will keep an eye out for the samples.