Need help with expense split

I have two cards 1. Axis Atlas 2. Amex Platinum Travel

We are planning a 10 day Vietnam trip.

We will be booking flights and hotels on our own and not through any operator.

We have booked one side flights as of now using Axis Atlas from traveledge portal for 5 miles per 100 spent.

Which card should we use for hotels and return flight?

Thanks in Advance!