While I appreciate his initial suit in the first couple of seasons, I prefer (young) Static’s suit with the Black T-shirt. Adult Static’s suits both fine. The JLU one plays into his classic design more, but of the two, I actually like the Future Shock one better.
And thanks for simply calling him Static instead of Static Shock.
The second one looks better, but the first one makes sense as a starting costume. It's simply conventional clothing. Something the comic book version never was. I liked how they referenced it in Rebirth of the Cool.
The first costume from early on in the DCAU was great since it was simple in how it was, while Virgil's second costume in later "Static Shock" works so well for him since it shows him to be more of a seasoned hero than he was when the series began.
Static Shock (1st suit)
Static Shock (2nd suit)
Static Shock (Future Shock)
Justice League Unlimited 
