i've asked the Transformizer support about this recently. Their answer was that the only considerable difference is, that you don't have manual control over the advanced features like pitch transpose, pitch tracking, amplitude tracking.
However, you can still use all of these features via the Randomizer function. I've attached a screenshot from the manual to show how it works.
"Transformizer Basic builds on the same adaptive engine as the full-blown Transformizer Pro plugin that was originally developed with professional sound designers in mind. Importantly, the Basic version was optimized for music production rather than being a less capable edition of Transformizer Pro. While sound designers may find a need for blending three or four different sound sources and have detailed control over many parameters, music producers will be pleased to find that the Basic version is delivering faster results.
The core algorithm under the hood of the Basic version and the sound quality it delivers is the same as in Transformizer Pro, but in order to deliver fast and inspiring results, Transformizer Basic lets the user work with one master and one child audio file and kick in the magic instantly, using a Randomizer feature.
Potentially, there are millions of possible results when 'transformizing' so setting a degree of randomization and simply hitting the Randomize button repeatedly will conceive unique results instantly and continuously. Once a desired sound has been created it is simply a matter of saving or rendering it to a new track."