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Here in Italy there are many factories of good diving equipment: Scubapro, Cressi, Mares, Salvas, etc.
The best one was probably Technisub, which was founded and co-owned by L. Ferraro and J. Cousteau. But it is now part of Aqualung.
Regarding fins, apart the brand, you must find the proper geometry, optimal for your legs. There are three parameters: length, stiffness and the angle between the blade and the sole.
A good finned swimming instructor can guide you on the choice of optimal fins during some hours of training.
The optimal fins are different for each human.... Exactly as the optimal shoes or the optimal bycicle.
And of course it also depends on the environment, exactly as for shoes or bycicles.