What would be the main difference of GENX against competitor like XRP and PUNDIX?
This may not be the best answer to your question. But I think the main difference would be in their algorithms. They are very different. Pundi X are tokens and XRP are not. All their technologies are incompatible for now. Yet I believe GENX will be better in time. And though it is a new coin, the room for growth and new technology is big enough to handle future successes.
I am glad GENX would move from POW to POS, but in what month/year we are expecting to see this implementation?
As stated by darkenedsoul earlier, GENX will not move away from PoW to PoS. But GENX will become a hybrid coin with both PoW and PoW with MNs feature. And it is said by the Team to be implemented soon as can be seen in the roadmap.