Will YouTrip have a multi-wallet choice?

While from an ops perspective it's important to make sure choice is well defined, realistically from a customer point of view it wouldn't be relevant in most instances.

Consider - the only time where multiple wallets/auto-choose important is where you have balances in multiple currencies other than the transacted one and insufficient balance in the transaction currency. The usual case for most people would be having (a large?) SGD balance and some balance in the transaction currency. It seems odd to have balances in a whole bunch of other currencies right? Anyway - your mileage may vary but I think YT current approach (a predefined list of currency buckets to deduct from) is keeping simple given relative rarity of use case.

Currently, it is a toss-up between Revolut and YouTrip for me!

Revolut provides a $350 fee-free ATM withdrawal which could be useful in a pinch.

However, Revolut is known to have a mark up in exchange rates during the weekends.
My personal recommendation would be to hold both!