If one is buying a new gun it is absurd to purchase a 3" model for two reasons. 1. being resale and 2. Twice as many load options.
In some cases when a gun is paired with a particular choke and load, the gun may prefer the 3" over the 3.5. The 3" is more than adequate out to forty yards when paired with proper choke. But with this being said the 3.5 inch shell has more pellets to begin with thus the chances of producing more pellets in your favorite sized circle is better when properly matched to the choke tube.
As for the recoil aspect, yes on average their is increased recoil. But with this being said there are some 3" shells on the market that kick harder than some 3.5 inch shells. The black WIN HV SUPREME 3" shell kicks more than some 3.5 inch loads I have fired. The recoil from the bronze 2.25 oz Hevi shotshells in 3.5 is not bad at all due to the low velocity. Buy yourself a lead sled for patterning if recoil is a factor they work wonders.

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