Cutting and raking widths

How important is it to match your mower width to the raking width? Going to be buying a new mower and rake this year and was getting ready to pull the trigger on the rake but not sure yet on what size of mower I will be getting. I am considering a mower anywhere from 10-13 foot cut and the rake I plan on purchasing is available in either a 27 or 30 foot max raking width. Most of the time my grass hay and oat hay is tedded out so I don't think it would make a difference on that but I usually don't Ted alfalfa.

Cutting and raking widths