The odds of survival are slightly better for Ezra; he’s not a Jedi Knight just yet, and he could totally leave the life behind if he has to watch Kanan die.
The end is likely nigh for at least Kanan, as there were no full-fledged Jedi running around the Rebellion during the original trilogy.
The Season 4 trailer indicates that Sabine will have plenty going on in Mandalore even if she does survive.
Unfortunately, none of the Rogue One Easter eggs gave away that anybody other than Hera and Chopper survived.