sorry for resurrecting an older thread (three weeks old), but I was wondering the same thing. So, I created a table to summarize the differences. (See below)
In all, the main difference between the two is the CF 7.5 can handle a higher current +1.6A and has a bunch of additional features, while PC 3.5 can run off a single cell pack (with a simple hack). This leaves you with a couple trade-off questions. Do you want and actually need additional current? Or would you value a smaller form-factor (using a single cell pack)? Are the additional features actually worth the extra cash.
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