Any recommendations of which e-wallet to use?

For me personally, I use Grab. The reason is as follows:

I link my credit card to grab (I’ll get credit card points/rebates/ miles etc)

Then once u top up to your grab wallet, any spendings will enable you to earn grab points. So you can get the gold/ platinum etc. this allows you to change for rewards and also certain benefits

On top of that, I link my fave account to grab. That way, when I spend through Fave, I get fave cashback, then grab points, then credit card rewards.

To me personally, this is a triple win situation

Hope this helps! Cheers

I currently do lots of payments with Favepay (and it's tied to GrabPay). They used to have some really good rebates where I would spend say 5 transactions of $5 each and I would get $3 cashback which is not bad. The current reward is now 10 transactions of $3 for a $1 rebate which is quite sad IMO.
Other than that, paying with Grab for food avails more points, which is always a plus!