Exploitive vs Exploitative - What's the difference?

Exploitive is considered to be a synonym of exploitative.
As adjectives the difference between exploitive and exploitative is that "exploitive" means "to take advantage"/ "taking advantage of someone",
while "exploitative" is in the nature of exploitation; acting to exploit someone or something.

For examples, see here.

Grammarist however takes a different approach. 

The preferred form of the adjective meaning tending to make use of selfishly or unethically is exploitative, not exploitive. This preference is shown across all main varieties of English. A few dictionaries accept exploitive as an alternative spelling of exploitative, but most correctly acknowledge that the latter is the far more common form.

In edited publications there is generally a preference for exploitative rather than exploitive. If one examines the use of "exploitive" and "exploitative" in a large number of English-language works published in the 20th century, it seems that the longer form is now preferred by a huge margin.  In current news sources, for instance, the ratio is about 20 to one.