Hi
If you want to use an aeroplane efficiently you would be best adviced to get an IR.
Depending on funds etc you can choose FAA/CAA.
FAA groundschool less 'heavy' but restricted for use only on N registered machines afterwards.
Oh and FAA is a lot cheaper overall.
If you are not sure you could do worse than getting an IMC from a good school. This will allow you to test the water and any IMC flying will go towards your FAA IR ticket.
FD