I'd personally stop DBZ with the end of Frieza's saga.
Just goes way downhill from there. Would also disassociate it with OG Dragon Ball because the direction is just way too different and off putting.
On the other hand, we get MORE TFS, so actually I think I'll retract my statement.
DBZ was nice but I've said it before Goku, Vegeta, Gohan hogged to much screen time which bothers me a lot because a lot of my favorite characters from the series i.e. Chiaotzu become non existent.
Monster Soul was really good and I could see a lot coming from it but Hiroshi Mashima had to end it at the end of the second volume. I would have loved to see a more extended plot and stuff this goes for his other manga Monster Hunter Orage which could have been dragged on for who knows how long as long as Capcom can keep spitting Monster Hunter games out.
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