"All purchase activity" or "All purchase activities"?

I am checking the grammar for my app and I find myself being unclear on which of those two I should use.

The original sentence runs as follows:

Once you start using your card, all purchase activity will be displayed here.

I have conducted some research, and it looks as if either could be used.

Is there a difference between the two? If so, which one would be more appropriate and/or grammatically correct, for my app?

I would greatly appreciate any and all replies.

Solution 1:

The former is uncountable, the latter countable.

The former is more formal, and also more elegant, in this case.

Other than that, the two mean exactly the same thing.