[Dx4win] cd rom call book best?

[Neil Carr G0JHC]

I wish to use the  call up feature where DX4WIN inserts the name of the
station I work via a CD rom call book. There are 4-5 callbook options.

Which is the best one to purchase for look up  (out side of the USA calls)

 

Thanks

 

Neil G0JHC