From my experience in air taxi, Aerads are alot cheaper to use then Jepps in regards to a plates and updates service only. I'm not sure why the airlines choose Jepp but I think it has something to do with flight planning and briefing services offered as a package.
I like the new Aerads layout but there are still alot of fields in the UK that need to have the modern layout applied to the plates.
The old Aerads style plates that are still in use for alot of the smaller European airports are not great IMO because they are very easy to misinterpret.