Which is the best credit card to use for youtrip topup?

So far I saw YouTrip is specifically excluded from Citibank and UOB card. But it worked for Standard Chartered Unlimited Cashback. I've tried and gotten 1.5% cashback on all my YouTrip top-ups with that card, at least at the of time of this post. Hope it helps!

Update

Think they found out about it and have since excluded it from the cashback calculations.

Well, there might not be miles or cashback, how about free installment perks? Well, if you use OCBC Cashflo, you can get free 3 month (>$100) or 6 months (>$1k) installment.
In addition, unsure true or not, you might still be able to get 0.5% to 1% rebates.