I think this version is one of the bigger steps forward. Now that you have
Fiery Confluence,
Chandra, Torch of Defiance,
Pia and Kiran Nalaar,
Quicksmith Rebel, to a lesser degree
Sin Prodder and even more exotic choices like
Jaya Ballard, Task Mage and
Exquisite Firecraft you are much more a control deck.
One of the problems that has always plagued this deck is that the lock pieces were good, but the followup creatures were just plain bad. since
Goblin Rabblemaster this has partly changed, but all the other guys in the deck are still not really worth their cardboard.
Magus of the Moon is a necessary evil, but a Gray Ogre is nothing to write home about.
With
Firy Confluence you want to play less creatures and with Chandra you finally have something else to play that is worth it.
Ensnaring Bridge has always been a great sideboard card and now you can legitimately play it main as it wins some of your worst matchups (BR Reanimator, Sneak & Show) pre-sideboard. With stuff like
Pia and Kiran Nalaar and
Quicksmith Rebel you have good pingers to kill the smaller creatures and to sit behind a bridge and shoot down your opponent.
I think you cannot really compare this to what the deck is with
Goblin Rabblemaster as it also works entirely differently strategically. If you have creatures you will not want Bridge or
Fiery Confluence. You want more aggressive creatures and no
Quicksmith Rebel.
TLDR: If you like Stompy then play the Rabblemaster version - if you like prison then play the Bridge version.