What is the best MFi game controller for PPSSPP for an iPod Touch 5?

[topazal]

I've looked up various choices, including the Logitech Powershell and the Moga controller, but I'd like to know if there are any recommended ones that work best with PPSSPP. I prefer the ones that connect to the device directly and can be used as a case rather than the Bluetooth ones (so I'm not really looking for something like the Steelseries Stratus controller). If it can work with gba4ios as well, that'll be great. Currently, I'm leaning towards the Logitech Powershell controller. I read that it can even double as a power bank, so I'm really interested in buying one.