So if Breen & Paddon do go to M-Sport as rumoured, do you guys think this is better for their futures than part seasons with Citroen & Hyundai respectively?

The advantage would obviously be guaranteed full season, gaining experience & momentum on every round rather than more pressure on every event they compete in.

The disadvantage is not being in a "factory" backed car. Citroen are going to fling money at the car now(by the sounds of it) but it looks like Breen is not going to be there to reap the rewards, and of course the Hyundai is fast as is and will continue to be developed.
The Fiesta is only going to fall behind on development as time goes on.

Of course my hope is a full season will suit both drivers (particularly Breen who hasn't got that chance yet) but only time will tell.