Commodore PET: Choosing a Computer Made Simple

The PET had been around for nearly five years by the time this advert was published, and so it's less of a case of advertising the hardware - which hasn't really changed much, apart from a bigger screen, updated BASIC and more memory - and more of a case of advertising the software available for it, the uses it could be put to, and the support you could get for it. 

Software was rapidly becoming the more important differentiator, a fact which Apple knew only too well as the release of VisiCalc in 1979 unintentionally put the Apple II into the "must have" category, saving Apple the company in the process.

Sales of machines would live or die by the number and diversity of titles available, and bigger companies like Commodore would invest money (or early on, simply encourage enthusiasts) to write enough of its own to make sure it had all the major applications covered, if they weren't being addressed by third parties.
