Durability? Steel. I mean, I don't think you'd have problems w/ that SPecialized, but if that's in your top 2 criteria, I'd go steel.

Versatility? The Masi or the Salsa both have the braze-ons to be geared up later. Flat fixing will be easier with fenders because of the forward-facing dropouts. Those 2 things make them way more versatile.

But the Salsa wins. Painted stem. Sugino cranks. Better wheels (Surly hubs laced to Delgado rims! vs. Formula/ Alex). If there's less than $150 difference, I'd go with the Salsa over the Masi.