Pad controller and converts question

2 questions:
i)are there any good controller pads that work good for both ps3 and xbox? (price range)?
ii) if i have a ps3 pad but want to use it on a xbox 360 whats the best type of converter (with no input lag) out there? (price range?)

Buy a PS2 controller and eTokki converters.
http://etokki.com/Xtokki360
http://etokki.com/iNPiN-PS2-to-PS3-Converter

I wonder what you’ll find in this link…

thank you very much <3