With a solid hub, the clutch will not be as forgiving. The phrase "piss or get off the pot" comes to mind. However, the solid hub weighs less, which could be beneficial to a racing engine.
edit to add: The "puck" style clutch discs are typically only used on race cars. The fewer pucks it has, the more harsh clutch engagement will be. And less pucks also means shorter clutch life.
To sum it up, unless your Fiero is a race car, it would be wise to use a full-face clutch disc with a sprung hub. Or if you're going for a street/strip application, then a 6-puck disc with a sprung hub (or full-face with solid hub) might do the trick.
[This message has been edited by Blacktree (edited 08-01-2013).]