Only reason for doing CPL exams is if you're definitely never (and absolutely certainly not within the next 5 years) going to want an IR.
For most commercial applications, you'll need an IR, so go straight for the ATPL exams. There are a few jobs out there which you can do with a CPL but no IR (things like aerial photography, for example), but not very many. The only exception is instructing, and the CPL exams seem to only really be of use to people who only intend to use the CPL purely for instructing.
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