The only bit of advice I would give you is read your training contract, particularly if it says anything about penalties if you refuse a position with ryan air. remember if your contract only refers to a position with ryanair and you are only offered a brookfield contract, then you are not being offered a ryanair position, correct?
Do work out what you will gross for your 900 odd hours on the brookfield and any tie ins. If you were retained (ie ryr contract) at STN you would be on a basic i think of about 13,000GBP before tax and about 900GBP per month tax paid of sector pay(going up to 1800 per month after 6 months) which seems like better money to me!
It may be that you have other options as a type rated 737 pilot with a couple of hundred hours on type. All I am saying is that don't just blindly accept what is offered.....