WeLab offers a $50,000 3-month 4.5% deposit, while also giving you 8% cash back through spend on its debit card for the first $3000.
Mox is giving 1% interest rate (paid out daily) on the first 1m put in its account, 1% cash back on all spend, and 5% cash back on spend on specific merchants such as McDonalds, Foodpanda, and OK.
WeLab and Mox are the best (in my opinion) as they are the closest thing to an actual bank, with the long term goal of actually being a better banking alternative. It also provides a debit card for spend and ATM withdrawals.
The other ones, like ZA and Airstar, are more like Marcus by Goldman in the US / UK. Occasionally giving out decent rates to raise some cheap funding, but it doesn't feel like a full banking alternative. They are definitely not developing in the same way as WeLab and Mox, which I often compare to Monzo and Starling.
Suggest you start out with those 2. No point opening too many - these are bank accounts after all!