Hi,
considering both companies, I would by far prefer Star Air. It is probably one of the best jobs in Europe you could get at the moment. Fluctuation is almost zero, very solid mother behind (Maersk) and a long term contract with a big worldwide express service provider. They operate 11 B767 freighters out of CGN, excellent salary and roster.
Aerologic is operating a newer type (B777), but it is tough work with LEJ base. Salary by far lower than Star Air. First bunch of pilots already left again.