You seem to be in complete dream world matey, as others have suggested. Its not as easy as you think, no one in your position has a choice between these two airlines in 2015. For you to seriously consider BA you would have to go through the FPP which to pass all the stages is for the very few, or to be a experienced airline pilot already, with many hours on a company type to be considered, even then you have to go through the direct entry pilot process which is not a given and I know of very competent pilots who have failed it. The suggestion of you need to take whatever you get is very very apt in 2015, that's the situation as it is now. You simply don't have the choice between flybe and BA, you could very well join flybe but there is no realistic progression to BA from flybe.
Your question really should be how likely I am to get any sort of airline job in 2015, not BA vs flybe, even experienced flybe guys don't have that choice and they are 5 years ahead of where you are at.