I have heard a lot of rumours about BGS is putting the helicopter ATPL database together with the Aeroplane ATPL database and that why you will waste some time on question you never gonna see in the real exam, don't know if this is true?
I know alot of people using atplonline and all of them are pretty satisfied with the database which is probably the most up-to-date database, but aviationexam is also pretty nice as well
best of luck