At Superior Air we offer helicopter students both the CPL (H) and ATPL/IR (H) theoretical knowledge courses. Either the CPL(H) or ATPL/IR(H) theoretical knowledge examinations are required to obtain the commercial pilots licence, however the ATPL/IR(H) examinations are of a higher level and allow you to obtain an Airline Transport Pilots Licence in the future once you have attained the required experience as a pilot. For this reason most students naturally choose to study for the ATPL/IR (H) exams from the beginning.
You may wish to take the easier option of the CPL (H) theoretical knowledge only if you are certain that you will not want to operate larger IFR/multi pilot helicopters in the future. The CPL (H) theoretical knowledge can be upgraded to ATPL/IR (H) knowledge at a later date, but it is a much more lengthy process than just obtaining the ATPL/IR (H) theoretical knowledge in the first place.