I can't claim to have looked at every Heller sailing ship kit, but I've looked at a lot of them. In my opinion, from the standpoint of serious scale ship modeling, 10 of them are worth building: Le Superb, Le Glorieux, Pamir, Passat, Preussen, Gorch Fock, Royal Louis, La Reale, La Belle Poule, Le Pourqois Pas?, and the big Victory. Oh - and I guess the Nina, Pinta, and Santa Maria are ok, but pretty basic (and the Nina and Pinta share the same hull).
Note that Le Soleil Royal is not on my personal list. I've gotten into lots of arguments about that, but I just can't take it seriously as a scale model.
As I remember, Heller got into the sailing ship game back in the sixties. It started out by reissuing Pyro and Aurora kits under completely fictitious French names. Then it took the tack of picking subjects that looked pretty, and featured lots of "carved" detail. Heller's artisans were always among the best in the plastic kit industry. But they seem to have possessed a bare minimal understanding of how sailing ships are built.
In the very late seventies and early eighties something happened: Heller started making scale sailing ship models. Their kits continued to feature some stupid mistakes and omissions (did the Heller designers really think the Victory's yards weren't fastened to her masts?), but by most reasonable definitions the kits were scale models.
As I understand it, Heller had a lot of highly sophisticated sailing ships on the drawing board when, in the mid-eighties, the company went belly-up. It's interesting, and depressing, to think about sailing ship kits superior to the Heller Victory.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.