Within badguy shooting range there really wouldn't be any noticable difference. There is a formula out there that will tell you velocity difference for every inch of barrel. If I can find it I will post.
Bullet velocity, slight edge to the 3 inch.
3 inch seems to look better with factory combat grips, and the sight plane is a bit longer, the 3 inch with target sights will aim better. The 3 inch without the lock is more desirable than with the lock.
The 2 inch conceals better, and is more "appropriate" with boot grips (looks silly to me with combats on).
Both hold five rounds . . . enough for a close up problem.
That 3 inch is an old Camfor offering, just got it Friday - NIB (unfired).