I'd recommend GSNES. I tried the other one but it had some issues for me.
Also if you check 'run unsigned apps' from the security settings, search and get VBAoid for a really good free GBA emulator. PSX4Droid 3.0.5 or 3.0.7 is another good one for PSX, unfortunately I changed phones and now can't find a D/L link for it that works
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