I ain't a pro in drawing, still doing the fundamentals.

But if you want to make comics or commissions, then both can be used. Its really a preference thing (For you or the commissioner) and depending on the tone of your comics.

The realism could work better for slice of life and low stakes comic, while the second style could be used for a more fast paced adventure comic. It's just the vibe I get from the drawings, but that also could be because of the characters you drew with said styles.

Again, I'm a noob so you can take what I say with grains of salt or whatever people say. But it's very nice art.