Gamepad / controller recommendation

I’m considering buying an ipega gamepad such as 9083/9083s or 9167, because I would like to use the same gamepad on my iphone and ipad. I know these aren’t perfect or super precise, but It’s for very casual gaming. I’m worried about possible incompatibilities - read some online posts but got to no conclusions. So my question is: is anyone using any of these with Retroarch for iOS? (sideloaded) ? Can you share your experience? Thank you!