You have posed a false delimma based on inaccurate information.
IDPA/SSR is ruled by the K/L frames with speedloaders. I use the Pachmayr Pro Grippers on a model 66 at present. Strength and coordination are an advantage, but that can be inproved with training.
The most important factor in shooting IDPA/SSR is learning the correct grip, trigger control, and gun handling (reloads).
On some stages, you can spend as much time reloading as shooting.
In USPSA revolver, the model 625 with clips rules. Many different grips are available.
What I see most often is that a younger person will try a revolver and find, quite correctly, that considerable practice is needed to master the gun handling and reloads, so they quit. Practice reloads 20 minutes a day for a year and you will get proficient.