I am looking to join other mobile provider because of existing mobile plan rising. I found TPG offer $15 per month for the first 6 months, then $30 per month.
Anyone knows how the reception and performance is? I go to Hurstville regularly for grocery and that place have poor reception with my Telstra sim.
Seeing all the bad review, I am now considering Vodafone.
TPG is just Vodafone. In any significant urban area it's going to get down to whether you have something close to line of site to the relevant tower.
In the major cities, any one provider should be as good as any other, but localized black spots might be a thing depending on where the specific tower is located and what's between you and that tower.
If you're having trouble with Telstra, there's no reason why you shouldn't give a Vodafone retailer a go and see if you can do better.
If there's a specific building or address you want to check to find out where the nearest towers are you can find that out here https://www.rfnsa.com.au/