I always encourage students from my Modern Calligraphy workshops to try out different nibs. Each nib have different personalities and lead to different styles and results. I definitely found my favorite nibs through trial and error.
Related: My Favorite Basic Calligraphy Inks
Here's 4 of my favorite nibs I often use:
Hiro 41 - Hiro 41 and I didn't like each other at first. It was in the bottom of my nib box for quite some time until I began practicing Copperplate calligraphy. This nib is perfect for it. I have yet to find a nib that achieves the square top and bottoms in Copperplate like Hiro 41 does.
Nikko G - Like Hiro 41, Nikko G and I first didn't like each other. It's a very stiff nib and in the beginning, I wanted to achieve that super thick downstrokes. It's always a hit in my workshops though and a great beginner nib. If I ever want to achieve a more romantic, and sort of dreamy kind of style or practice Spencerian calligraphy, I go straight to Nikko G.
Brause EF 66 - Speaking of super thick downstrokes, Brause EF 66 was my very first nib soulmate. It's not beginner friendly and the most flexible out of all my favorite nibs. It's a pain to clean cause the nib is so small. But if I want that nice contrast of thick and thin strokes, Brause EF 66 is it.
The Brause Steno Pen Nib aka The Blue Pumpkin - The Blue Pumpkin (its nickname) is a great beginner nib and even now, it's what I use everyday. It's stiff but has a little bit more flexibility to it. One of my favorite nibs for modern calligraphy.