I was with Maxis and switch to Umobile previous plan GX68. In terms of speed, the response is better than Maxis especially on
peak areas/hours but coverage wise on most city or central area, no issues unless in rural areas you will see a weak side vs Maxis.

Green telco already 'abandoned' old customers since a freaking lot of years ago

The only way you get 'reward' is to sign up those phone plan (contract) which in my opinion is not worth it