My answer . . .
Any of the three styles that you find and like. They are all fine guns.
Mine have hammers because I was looking for a vintage, "no-dash" steel gun and a vintage, "no-dash" Airweight . . . and both of 'em that came along happened to have hammers when I was in the market.
I practice a proper draw to monotony, and thus the hammer is NOT a problem.
The hammer IS a plus on careful, slow fire stuff. There's always the possibility you'll be in the back of a convenience store when a thug comes in starting to shoot people. You may find concealment and cover, and be able to make a steady, braced, single action shot that puts the BG out of commission at a greater distance than you might feel comfortable with taking double action.
Plus, you only have five shots before you are done . . . or have to reload. You better make 'em count.
T.
PS: I long ago mastered the double action pull when shooting hundreds of steel, tactical and pin matches. Double action is THE way to go when you need to fire fast and under stress. Accuracy can be great too . . . if you've practiced until mastery.