Hi storm
Have friends that work for both companies.
GB is work intensive and have several nightstops abroad
but I am not too sure on what their take home pay is... if you like a more "home" lifestyle then GB could be for you.
BMED is all medium/longhaul and can have you away from home for up to 6 days at a time. Again dont know what the take home pay is but my sources say it is a good crack. ie fun times down route.
Sorry cant offer any more info