
This is going to sound horribly metro, but when I find a watch model that I really like, I try to get a matched set so I can coordinate them with what I'm wearing - gold with warm colors, silver with cool colors. My gold P3 goes great with an orange shirt whereas I like to wear stainless with black / blue / purple.
Here are some of my favorite sets. I can't decide which I like the most although I'm currently partial to my matching P4s, my Hamilton QED's and the matched pairs of TV faced Accutrons.
One other thing - the gold and stainless Pulsars are different shapes! For the P3s, the stainless model is more rounded and the gold model is more square (look at where the lugs meet the case). I prefer the shape of the stainless P3s. For the P4, the gold model is longer horizontally than the stainless model. For the P4s, I tend to prefer the shape of the gold models.
-abe.