The more important choice is that of the maintenance organisation. You must choose one that has a deep understanding and long experience in the maintenance of the type and model being maintained.
Most manufacturer's maintenance schedules require too much unnecessary maintenance and not enough necessary maintenance, resulting in the Waddington Effect. Unfortunately, the person considering whether to approve a System of Maintenance must take into consideration the manufacturer's maintenance schedule when deciding whether to approve the System of Maintenance, so often the same outcome is produced.
Incompetent, misguided or pencil-whipped maintenance produces the same practical outcome, whether it's done under the manufacturer's maintenance schedule, the CASA maintenance schedule (i.e. Schedule 5) or an approved system of maintenance.
An experienced maintainer will know how and when to do more of the necessary maintenance and less of the unnecessary maintenance. Schedule 5 will give you more flexibility to do that, if you have the option to use Schedule 5. If you can get the same flexibility enshrined in an approved system of maintenance for the aircraft, so much the better, but the manufacturer's maintenance schedule may get in the way.
(Typical example of this and the Waddington Effect: Injectors on fuel injected piston engines. They are constantly cleaned in operation by a wonderful solvent called 'AVGAS'. The greatest risk of them becoming partially or completely blocked arises during removal, cleaning and replacement required by maintenance schedules. Some engineers may produce scary pictures of dirty solvent after injectors have been removed and 'cleaned'. The dirty stuff comes almost entirely from the outside of the injector. An engine monitor and knowing how to use it will tell you if you have a partially or completely blocked injector.)
Unfortunately, the drive for getting rid of Schedule 5 or an equivalent and imposing more maintenance more often is driven by people who think that more maintenance more often must equal more reliability and more safety, and who - surprise surprise - make money from doing maintenance or regulating the doing of maintenance.