I think Carl summed it up nicely.
If you like an italic nib, (calligraphy style) it just about has to be a JoWo as I have found few other italic nib distributors.
Heritance (India manufactured) made a very nice fine point 5 and 6 mm, but the fine point is difficult to find. Personally, I don't care for the Heritance Medium tip, but many here DO like it.
My favorite is the 6mm Bock Fine point nib. They are pretty easy to come by, fit both Berea and Dayacom feeds quite nicely and they are value priced.
I'm sure you will find as many opinions here as there are many possibilities. My suggestion would be to try SEVERAL manufacturers and tips until you find the perfect one for your writing style. What works well for one person is NOT a "fit all" for everyone. Nibs are relatively inexpensive and I'm sure you'll find one that you prefer.
Respectfully submitted.