One notable thing about Dragon Ball spin-off manga is that it can expand on the backstories of minor characters or present alternate timelines. Sometimes, it introduces fresh powers and abilities that weren't in the original. The art can also vary, giving a fresh look to the franchise.
A spin-off manga is like a branch off the main manga tree. It takes elements from the original, but tells new tales. It differs as it might have a narrower focus or explore aspects not central to the main story. For example, it could center on a supporting character's adventures.
The Fairy Tail manga has reached its conclusion. It offered a satisfying closure to all the storylines and character developments that fans had been following throughout the series.
Fairy Tail manga is indeed finished. It had a long run and provided a satisfying conclusion to the fans. All the major plotlines were resolved and the characters' arcs came to an end.