Brand comparisons usually run on opinion. This one runs on settled transactions: 187 recorded sales of Girard-Perregaux and 125 of Bulgari, all in US dollars so the figures are directly comparable.
What each one actually costs
The median Girard-Perregaux result is $6,144. The median Bulgari result is $3,500. On typical examples, Girard-Perregaux carries roughly 1.8 times the price of Bulgari at auction.
Half of all Girard-Perregaux sales land between $3,125 and $14,375. For Bulgari the middle half runs $1,664 to $9,600.
Which one surprises the specialists
42% of Girard-Perregaux lots beat their high estimate, against 48% for Bulgari. The two are closely matched, which suggests both are priced with similar confidence.
Breadth of the record
Our archive covers 84 distinct Girard-Perregaux references and 23 for Bulgari, with results going back to 2004 and 2006 respectively. The top recorded result is $193,350 for Girard-Perregaux and $277,200 for Bulgari.
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.