All depends.
Epping/Eastwood is strongly influenced by Asian investors who seems to have bottomless amount of money and are not really influenced by interest rates (they paid all in ca$h remember, no negative gearing/holding costs required). It would probably hold value the most.
Inner West, it seems to have high demand all the time but units/apartment is major concern given tons of them being built. House/terrace should be OK unless they paid emotional prices in auction.
Hills District is interesting one. NWRL is coming at 2019 so that should hold the price a bit, especially all those suburbs are newish and have feel good factor. But then again, some land at Kellyville closer to train line is selling like 800K for 700sqm, and new OTP 2br apartments at Kellyville far away from NWRL line, are selling at mid to high 500s. I think that is crazy.
Blacktown/Mount Druitt I dunno too much but unless there is massive number of new people moving in there, I don't think gentification will be quick enough to improve the image of those suburbs.
I think at the end, houses will hold value the most. I cannot wait to buy older apartments at cheaper prices when all those OTP gets completed in year 2017-2019.