Case-style conventions

In creating a case style or caption, must I use the ALL-CAPS convention, like this?

UNITED STATES DISTRICT COURT
FOR THE DISTRICT OF DELAWARE

ANDREW FREYTAG,
Plaintiff

WILMINGTON CUTTER, INC.,
Defendant

Or may I use boldface type, like this?

United States District Court
For the District of Delaware

Andrew Freytag,
Plaintiff

Wilmington Cutter, Inc.,
Defendant

LEGIBLE