I'm in the process of getting UK passports for my 2 daughters so they will become British citizens by decent, once they get the British passports can they still use their Canadian passports to go to the USA for vacations etc. or are they now required to use the British passports whenever they go to visit in the USA, or is it their choice as to which passport they use?

Thanks

Use the Canadian ones. I always travel to the USA as a Canadian. It's easier.

The Canadian one - travelling to the US with a British passport is a complete pain in the behind. The main reason why we applied for Canadian passports is so we can get into the States easily.