When comparing Snes9x EX + vs RetroArch, the Slant community recommends RetroArch for most people. In the question“What are the best SNES emulators for Android?” RetroArch is ranked 1st while Snes9x EX + is ranked 3rd. The most important reason people chose RetroArch is:
RetroArch is built to be an extremely customizable emulator. You can edit and customize almost every part of the emulation experience (shaders, overlays, frame rate caps, controls, etc.)
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Pros
Pro Can emulate the Super Scope with the touch screen.
You can set your input method to super scope, touching the screen is the fire button and touching outside the screen margin is the cursor button on the handle.
Pro Open-Source
Advanced open-source SNES emulator based on Snes9x 1.53 with near complete game compatibility.
Pro Free plus no ads
This app is 100% free with no ads.
Pro Very customizable
RetroArch is built to be an extremely customizable emulator. You can edit and customize almost every part of the emulation experience (shaders, overlays, frame rate caps, controls, etc.)
Pro Most cross-platforming options
Cons
Con The interface isn’t the best looking
Con GUI is difficult to use
Like most other things that have to do with RetroArch, the GUI too is rather hard to use and un-intuitive for new users.
Con Notoriously difficult setup
The sheer number of options and settings that it presents the user with make it extremely hard to set up for beginners. It's not for the average user, it's for people who want to tweak their experience with emulators to the tiniest detail.