@sovietchild The 4.9% interest card wins if you pay over 12 months, due to the 5% fee on the 0% card. For a £1000 example, split over 12 months:
0%+5% fee:
£1000+£50 fee =£1050 payback
4.9% interest
£1000+~£25= £1025 to pay back.
As the 4.9% interest will be calculated daily, paying it off...