Gantz is super long and it’s really good but it’s my least favourite here. I still do think it’s great though. I recommend reading it last.
Berserk is long but it has one of the best arcs of all time, One of the best MCs of all time, it’s gory and disturbing. It’s a masterpiece.
JoJo part 7 is the best part of JoJo, it is Araki’s masterpiece and is the peak of his writing. It has the best JoJo, the best villain along with Kira, an amazing Jobro and the stands are awesome. It focuses on the story and characters more than other parts and is also the longest. Johnny is a lot more ruthless than any JoJo and Valentine is probably the most complex villain. I recommend this first since is the shortest out of these.
Vinland Saga is also a masterpiece in my eyes and is a must read. One of my favourites too. After the prologue, it stops being as action packed and focusses on Thorfinn’s character development. People complain about it and say it’s trash now but it’s because they don’t understand that it’s called Vinland Saga, not War saga.