Brand comparisons usually run on opinion. This one runs on settled transactions: 510 recorded sales of Panerai and 187 of Girard-Perregaux, all in US dollars so the figures are directly comparable.
What each one actually costs
The median Panerai result is $7,500. The median Girard-Perregaux result is $6,144. On typical examples, Panerai carries roughly 1.2 times the price of Girard-Perregaux at auction.
Half of all Panerai sales land between $5,060 and $12,075. For Girard-Perregaux the middle half runs $3,125 to $14,375.
Which one surprises the specialists
44% of Panerai lots beat their high estimate, against 42% for Girard-Perregaux. The two are closely matched, which suggests both are priced with similar confidence.
Breadth of the record
Our archive covers 87 distinct Panerai references and 84 for Girard-Perregaux, with results going back to 2003 and 2004 respectively. The top recorded result is $326,500 for Panerai and $193,350 for Girard-Perregaux.
What this does not tell you
A median is not a verdict. These brands overlap heavily at the edges, and a well chosen example of the cheaper one will outrun a poor example of the dearer one. Condition, completeness and model matter more than the badge on the dial.