If ur current requirement/setup does not need/have Dolby Vision, Atmos(Netflix) or AI Upscaling then 2017 version should be good.

Astro Go works fine on STV 2017 and should work on STV 2019 too.
U can set ur STV as a server so u can watch ur digital(remux) movie collection on another TV if u don't have home server/nas.

For gaming there are few options:-
1. U can gamestream from ur PC if it fits the requirements via few apps.
2. PS4 remote play under same network/location but the PS controller need to connect to PS4 instead of STV. There are few other workaround to stream PS4 to STV.
3. PUBG Mobile on STV
4. GeforceNow beta but currently there is no 'open' server for Asia region.
5. Emulation

Nvidia have removed all the 2017 model from their official listing & replace it with 2019 model..

There are used & new 2017 model sold by 3rd party seller on Amazon around $170 but not all can be shipped to Malaysia.
As for used unit, u won't be able to access Free GeForce Now beta if the previous owner has login since it is only exclusive for first account used to login.

U still can get new 2017 model at Lazada/Shopee & for GeForce Now access u need to show proof of purchase to Nvidia support.
Anyway, there will be black fridy sale & hopefully the offer price will be attractive.