Which is a better choice? New, or used preamp?

So I've been doing a lot of research, and am interested in people's opinions about a new vs. used tube preamps...

I'm looking for a good quality tube pre, maybe around $1500. People have recommended some new products (Doge an YS for example) in that price range, but I can't help but wonder if I'm not going to get a better performance with a used pre in that price range that used to sell new for maybe $2500-$3500?

That would be a 10-15 year old pre probably, so has the quality advanced such that the YS could present a better soundstage, for example?

Thanks,

Michael