All decks are really slightly different,
But after purchasing both Guardian 1's and now 2's, and working with Masters myself,
I really enjoy the feel to the Second Edition Guardians. And will be using both these, and Masters in the future.
Though I havnt had the chance to play too much with the new Guardians as of yet, I can already tell that they are much much better than the first Edition.
Im happy to compare after a bit more time, but for now, they seem to be pretty on par with the Masters (Which happen to be my favourite, and most used Deck)