Well, PhenixCoin by FAR has the best most experienced and devoted development team behind it, they surprise me and everyone all the time with what their doing. BitCoin will always be top dog in my opinion though, Im not even saying PXC will take over LTC, it wont, but if BitCoin is Gold, LTC silver, then PXC has the potential at the moment to be the bronze, nothing else out there now even comes close.