Common App EC description

How do you guys feel is the most effective way to describe ECs? For example, for a debate club, should I use full sentences like this:

I competitively give speeches. I have won 3 competitions. etc etc

Or should I be more direct but improper grammar with semi colons or commas separating different thoughts

Give speeches, won 3 competitions etc etc

I have a lot of stuff to say for all of my ECs.

Do you guys understand my question? If u can help, that’d be awesome.

Format it like a resume. “Gave speeches, won competitions, etc”