Further to the recent discussion...
I completely understand the viewpoint of playing less expensive surlyn balls. And if you lose a lot of balls, it is probably the best way to go. But I feel that it will keep you from learning/having a better short game.
I resisted urethanes forever. Last year I decided to give them a good test. I started with the 330 RX, which is not the best ball for short game spin, but it's better than surlyn. Later I transitioned to the tour balls. During this time, my short game has gotten much better. I'd like to tell you that it's all me, and not the ball. But I don't think so. I think the better ball allowed me to develop the game.
The urethanes have more spin, so they let you hit the ball a little harder around the green. It's like chipping onto a slower green. There's more margin for error in the force of your strike. Today the grass was long around the greens, so there was no thought of running a chip through it. I was playing a Duo, and a Chrome Soft. What a difference around the greens! When chipping to a close pin, the Duo requires perfection, or you might not even have a chance to get close. Several times after having no good chance with the Duo, the CS made the same shot fairly easy. Now if you play big greens and/or tightly-mown surrounds, you can learn to run up any ball. But if you have to carry it to the green and have some control, urethane will really help.
You cannot see this in one round of playing a tour ball. It requires a good long trial, so that you can adapt and learn what it can do. Maybe a couple months, or more.
Anyway, this is my experience. YMMV!