It depends. Sometimes a story labeled as 'memorial' might be based on real events, but it could also have fictional elements added for dramatic effect.
At the moment, there's no definite information on whether Berserk manga will continue. It might, but it could also remain unfinished. A lot depends on the circumstances and decisions of those involved in its production.
Yes, it is. Berserk has a rich and engaging plot, along with well-developed characters. The world-building is also top-notch, making it a standout manga.
For many, Berserk is indeed the greatest manga. Its intense plot, detailed art, and exploration of dark themes make it stand out. However, the concept of 'greatest' is subjective and varies from person to person depending on what they value in a manga.