Trigger wasn't better on the 3 compared to the S2. At least not on the ones I tried.
The advantage of the 3 is price, slightly longer barrel and sight radius, possibly slightly less muzzle flip and recoil. The last from one of Norway's best PD competitors, but he hadn't made up his mind yet.
I bought the Stock2 and only replaced the hammer spring with the lighter one tanfoglio makes (wolff hammer springs are a no-go in IPSC PD)
Tanfoglio On Line Shop is a bit confusing for me. Which part number is the hammer spring? Thanks.