It always seems tempting to have 2 (or more) versions of a deck. One for sending, one for presenting live, one short one, one long one, one for printing. Ideally, this is the right solution, but in practice, you always forget to transfer changes from version to the next. I prefer to keep one master file with all slides inside, and chop out the ones I do not need right before I present, email, etc.

The exception is probably a high-profile keynote that merits a file on its own, but for day to day business presentations, keep one deck.