For lifestyle wise, perhaps one should go for The Valley has it has more facilities.

For convenience (especially if you use LRT), Sunway Avila might be better choice for you.

I visited both also, end up I take Sunway Avila because long term wise Wangsa Maju area more potential compare to setiawangsa, as WM have multiple rental options and more convenience. 

One things I don't like The Valley is leasehold, high den compare to Avila and next to The Valley is sewage ponds😂