When in doubt, quality over quantity. You should always aim to focus on one or two themes and include a few experiences in particular. Never sacrifice depth and detail just to accommodate quantity.
If you write about all your relevant experiences, their significance will get lost in trying to compete for attention in a limited space. It looks better to hone in on key experiences and provide depth, self-reflection, and nuance. Your CV should list all your relevant experiences, not your personal statement.