Two preamps are available....

Question:  Two preamps are available for sale on Audiogon.....both are listed at the same, identical price. 

One is factory refurbished and "as new" with manufacturer's warranty from an Audiogon dealer and the other is in 9/10 condition from a private seller.  Both sellers have excellent feedback. 

- Which one would you buy and why?  
- What are your positives and negatives about units that are factory refurbished?

Thanks.