See also the Similar Threads below for the last few laps round this particular barrel.
Depends on your needs and workflow preferences.
The Trial is full featured, so you can go nuts poking and prodding, but use another drive so your originals are preserved and you can explore the default internal archive structures of each.
Aperture creates a single massive archive package (which can be a pain, but has advantages over iPhoto-style massive subdirectory tree). YMMV