I could not specifically find a topic on what I am curious about. Like a coin that has 2 sides I am getting 2 different opinions from those that regularly fly a Hershey bar wing 140 and those that flew hundreds of hours. One side says best landing on a calm day is 2 notches of flaps and only use 3rd notch if high or fast. The other side says to use 3 notches all the time. They all agree fly the numbers on approach and on windy days use the best flap setting for the wind conditions. What do experienced 140 pilots use on a calm day; 2 b notches or 3?
Full flaps. Use everything you have at your disposal...remember, the hershey bar cherokees have the glidepath of a brick...(I've owned 3 of them, aprx 800 hrs total in the model). That just means you have to manage the energy and balance against airspeed, glidepath, etc. It takes a little practice to get it right if all you've been flying are the typical 172s...but a couple hours of practice with a CFI who gets it with the hersey bar, and you'll be ok.
Occasionally (very), I've only used 2 notches on final, but it was a day that true believers of the goodness of Weick's design let us fly on days that Clyde's high wing birds were sitting on the ground. As many have said, go up and try landings with various combos (being primed, of course, to go around if necessary) of flap etc. within the limitations in your POH.
And, boy, do they slip nicely. To get a feel...go up to 5K AGL and put into a landing config, nose down, A/S needle at the 3:00 position, full flap, and crank in a forward slip. Amazing.
I could start a discussion as to whether the crab and kick or sideslip on final is preferred...but that's another can o'worms. But...in the cherokees, either can make you look like a hero.
Be safe, get some training, and enjoy the Piper experience.