I voted kits. But I don't mean 2e kits. I mean 3e kits as they could have been.
In my perfect little world (tm), the original splat books would have had no prestige classes at all (and wouldn't have started that particular rot). Instead it would have had kits in the sense of reciepes - "dread pirates learn swim, jump and intimidate, specialise in scimitars and take every third level as rogue"; "dark avengers normally even multiclass ranger and fighter, with a particular emphasis on hiding and spotting, they lose their divine spells and gain xyz instead".
i.e. I think 3e kits *done right* would have been example recipes to illustrate how multiclassing, skill and feat choice could be used to create all kinds of fantasy archetypes, and this would be supplemented by more example class modifications to build upon the dozen or so that are already mentioned in the PHB and DMG (that fighter/rogue hybrid, the ranger/paladin hybrid etc)
That is the 'kits' that I'd have liked to see. Ah well.
Cheers